- JavaScript was developed in 1995 by Netscape and was originally called LiveScript but was renamed to JavaScript due to Java's popularity. It runs efficiently by manipulating HTML documents via the DOM.
- JavaScript has undergone standardization and various versions. It is a dynamically typed language that allows adding and removing attributes and methods from objects at runtime.
- AJAX uses JavaScript and XMLHttpRequest to make asynchronous requests to web servers in the background without interfering with the display and behavior of the existing page. This allows for asynchronous data retrieval and updating of parts of a web page.
This document discusses 10 typical problems seen in enterprise Java applications. Problem #6 is having no data access object (DAO) layer, resulting in services directly using persistence mechanisms like JPA or JDBC. This makes code impossible to test without a database, tightly couples services to persistence, and provides no structure for adding data-dependent features like security. The solution is to use a DAO layer to abstract away the persistence, separating this technical concern from the service layer.
Introduction
Spring Boot testing features
Example of microservices with Spring Cloud
Component & Integration testing with Hoverfly
Contract testing with Pact or Spring Cloud Contract
Load testing with Gatling
Integration & end-to-end testing with Arquillian Cube
Summary
4-year chronicles of ALLSTOCKER (a trading platform for used construction equipment and machinery). We describe how the system has evolved incrementally using Pharo smalltalk.
Bytecode manipulation with Javassist and ASMashleypuls
The document discusses a presentation titled "Living in the Matrix with Bytecode Manipulation". It provides an overview of bytecode and frameworks for manipulating bytecode. Specifically, it discusses what bytecode is, reasons for manipulating bytecode, frameworks for doing so, and examines logging as an example use case. The presentation outlines how to add logging to methods by annotating them and transforming the bytecode at runtime using a Java agent.
Android architecture component - FbCircleDev Yogyakarta IndonesiaPratama Nur Wijaya
The document discusses Android Architecture Components (AAC). It describes AAC as a library, guidelines and standards that aim to standardize architecture and reduce boilerplate code. It discusses key components of AAC like Lifecycles, LiveData, ViewModel and Room that help address issues like lifecycle handling, data persistence and offline support. It provides code examples to demonstrate how these components can be used to build more robust Android applications that properly handle lifecycles and data.
This document discusses building a Java tracer using bytecode, JNI, JVMTI and ASM. It covers Java bytecode format, using JNI and JVMTI to build C extensions that interface with the JVM, ASM for bytecode analysis and manipulation, and a demo of using these technologies to trace a "Hello, World" program. It also outlines areas for further work on the tracer and takes questions.
10 Typical Problems in Enterprise Java ApplicationsEberhard Wolff
This presentation shows some typical problems that you will find in far too many Enterprise Java Applications. It is the result of quite a few code reviews I did as a consultant.
This document discusses 10 typical problems seen in enterprise Java applications. Problem #6 is having no data access object (DAO) layer, resulting in services directly using persistence mechanisms like JPA or JDBC. This makes code impossible to test without a database, tightly couples services to persistence, and provides no structure for adding data-dependent features like security. The solution is to use a DAO layer to abstract away the persistence, separating this technical concern from the service layer.
Introduction
Spring Boot testing features
Example of microservices with Spring Cloud
Component & Integration testing with Hoverfly
Contract testing with Pact or Spring Cloud Contract
Load testing with Gatling
Integration & end-to-end testing with Arquillian Cube
Summary
4-year chronicles of ALLSTOCKER (a trading platform for used construction equipment and machinery). We describe how the system has evolved incrementally using Pharo smalltalk.
Bytecode manipulation with Javassist and ASMashleypuls
The document discusses a presentation titled "Living in the Matrix with Bytecode Manipulation". It provides an overview of bytecode and frameworks for manipulating bytecode. Specifically, it discusses what bytecode is, reasons for manipulating bytecode, frameworks for doing so, and examines logging as an example use case. The presentation outlines how to add logging to methods by annotating them and transforming the bytecode at runtime using a Java agent.
Android architecture component - FbCircleDev Yogyakarta IndonesiaPratama Nur Wijaya
The document discusses Android Architecture Components (AAC). It describes AAC as a library, guidelines and standards that aim to standardize architecture and reduce boilerplate code. It discusses key components of AAC like Lifecycles, LiveData, ViewModel and Room that help address issues like lifecycle handling, data persistence and offline support. It provides code examples to demonstrate how these components can be used to build more robust Android applications that properly handle lifecycles and data.
This document discusses building a Java tracer using bytecode, JNI, JVMTI and ASM. It covers Java bytecode format, using JNI and JVMTI to build C extensions that interface with the JVM, ASM for bytecode analysis and manipulation, and a demo of using these technologies to trace a "Hello, World" program. It also outlines areas for further work on the tracer and takes questions.
10 Typical Problems in Enterprise Java ApplicationsEberhard Wolff
This presentation shows some typical problems that you will find in far too many Enterprise Java Applications. It is the result of quite a few code reviews I did as a consultant.
Дмитрий Демчук. Кроссплатформенный краш-репортSergey Platonov
Доклад будет посвящен возможностям библиотеки Google Breakpad по созданию краш-репорта. Посмотрим как это работает изнутри.
На примерах будут рассмотрены способы интеграции библиотеки на разных платформах Windows, Linux, Max OS.
This document describes the implementation of a simple REST server in Qt using reflection. It discusses how the Qt meta-object compiler (moc) is used, the abstract and concrete server classes, building the route tree using reflection, handling new connections in worker threads, calling methods based on the request, and using reflection for testing. The abstract server class inherits from QTcpServer and uses slots decorated with tags to implement routes. Worker threads handle individual connections and parse requests to call the appropriate method. Reflection is leveraged throughout to build routes and dispatch requests without explicit registration or mapping.
Groovy is a dynamic programming language that runs on the JVM and seamlessly interacts with Java. Grails melds the concept of "Convention over Configuration" and the dynamic power of Groovy to create a framework that greatly simplifies the development of web based applications. This slideshow explores the two - dive into some Groovy vs. Java code examples and see some examples of Grails. We'll also discuss when to introduce either into an existing (or greenfield) environment and where they have worked and where they have failed
Java 9 introduces modules to the Java programming language and its runtime. Despite this feature being optional, due to the modularization of the standard library existing applications might behave differently when running on a version 9 JVM. Furthermore, because of changes in the runtime, existing libraries and frameworks might not yet correctly process your modularized code. As a result, updating to a Java 9 VM and taking Java 9 into brings its challanges.
This talk discusses the practical implications of module boundaries and analyzes new limitations Java 9 imposes on the reflection API. This talk explains how reflection is used in popular frameworks like Spring and Hibernate and explains why existing applications might break or change their behavior when facing modularized code. Finally, this talk showcases alternatives to now failing Java programming patterns and weights their robustness with regard to the Java releases 10 and upward.
The presenter is an active contributor to open source and helped to migrate many popular Java libraries to supporting Java 9. As a consequence, he as been working with Java 9 for almost two years.
The document describes the development of a C++ wrapper class for the C libcurl library. It defines a curl::easy class that encapsulates a CURL handle and provides methods like set_url() and perform() to set options and execute requests. Over time, the class is refined to add functionality, handle different string types more generically, and improve exception safety. Template classes are introduced to represent C strings in a more object-oriented way.
This document discusses how debugger modules and plugins like Byakugan can help speed up the basic exploit development process. It provides an example using Byakugan to develop an exploit for a vulnerability in BlazeDVD in just one crash. Byakugan is loaded in WinDbg and used to find the offset to EIP when triggering the crash with a Metasploit pattern, identifying it as an SEH exploit. Byakugan's searchOpcode function finds a suitable pop pop ret, which is then used to build the exploit payload to launch calc.exe and demonstrate successful exploitation in a single run.
JavaScript: Advanced Scoping & Other PuzzlesSencha
In this session, we'll review the fundamentals of Javascript variable scope and common "execution context" (scope) challenges associated with early/late binding of event handlers, specifically within complex Ext JS layouts. We'll also bring several patterns (namespaced references, Function closures, inline references, ref/refOwner, and the "Poor-man's message bus") to bear on the bowl of soup we call "scope."
RxJava is a library for composing asynchronous and event-based programs using observable sequences. It allows avoiding callback hell and makes it easy to compose and transform asynchronous processes through combining, filtering, etc. RxJava uses Observables to represent asynchronous data streams and allows subscribing to those streams using Observers. It supports asynchronous operations through Schedulers and can integrate with libraries like Retrofit to handle asynchronous network requests in a reactive way. Learning the RxJava concepts and operators takes some time but it provides many benefits for managing asynchronous code in a declarative way.
Android Nâng cao-Bài 9-Debug in Android Application Development Phuoc Nguyen
This document discusses various debugging tools and techniques for Android application development. It describes the Android Debug Bridge (ADB) for communicating with an emulator or device. It also covers the Dalvik Debug Monitor Server (DDMS) for monitoring heap usage, threads, and more. Specific tools covered include Hierarchy Viewer for debugging layouts, Traceview for method profiling, and jhat for heap profiling. It also discusses handling ANRs, StrictMode for catching errors, and debugging tips like using logcat and Dev Tools.
Hybrid development using Qt WebKit allows developers to embed a fully functional web browser inside a Qt application. Qt WebKit provides a bridge between Qt and the WebKit rendering engine, allowing developers to load web content, manipulate web pages, and integrate their applications with web services. Developers can inject QObjects into web pages to expose slots, properties, and signals to JavaScript, and can also call JavaScript functions and extract their return values from the C++ side.
This document discusses concurrency and threading in Java and Haskell. It covers:
1) Threads allow concurrent programs to perform multiple tasks simultaneously through time-slicing, though execution is not truly simultaneous.
2) Java threads can be created by extending Thread or implementing Runnable. Haskell uses forkIO to spawn concurrent threads.
3) Shared memory access requires synchronization to prevent race conditions. Solutions include locking (synchronized in Java), STM transactions in Haskell.
Unit testing without Robolectric, Droidcon Berlin 2016Danny Preussler
Are you bound to flaky, slow Robolectric Tests? Do you want to know a way out of it? This session shows ideas and concepts to replace Robolectric from your test code base
Making Exceptions on Exception Handling (WEH 2012 Keynote Speech)Tao Xie
The document describes an approach called CAR-Miner for mining sequence association rules from software repositories to detect defects in exception handling. CAR-Miner constructs exception flow graphs from code examples, generates static traces, and mines sequence association rules of the form (context) Λ (trigger) => (recovery). It detects violations by checking if context sequences match rule contexts before missing recoveries. An evaluation on open source projects found that over 50% of mined rules represented real patterns, CAR-Miner detected more defects than previous approaches, and sequence rules helped uncover new defects.
This document summarizes key aspects of Java servlets including:
- The servlet lifecycle which includes initialization, service, and destruction phases.
- How servlets handle HTTP requests through methods like doGet() and doPost().
- How servlets can communicate with other components using various protocols beyond just HTTP.
- How servlet contexts allow servlets to share information and resources.
- How servlets can create, read, and modify cookies to maintain state across requests.
Software Testing - Invited Lecture at UNSW Sydneyjulien.ponge
This document provides an overview of software testing concepts and the JUnit testing framework. It discusses the importance of testing, different types of testing, unit testing with JUnit, best practices for writing tests, integrating tests into builds with Ant and Maven, and logging. Examples of JUnit tests are also provided. The key points covered are:
- Why testing is important to find bugs, prevent regressions, and allow for refactoring
- Unit testing, functional testing, and other types of testing
- How to write automated unit tests with JUnit
- Best practices like testing edge cases, achieving good code coverage
- Integrating tests into builds with Ant and Maven
- Using logging frameworks like Log
The document discusses various Kubernetes concepts including pods, deployments, services, ingress, labels, health checks, config maps, secrets, volumes, autoscaling, resource quotas, namespaces, Helm, and the Kubernetes Dashboard. Kubernetes is a container orchestration tool that manages container deployment, scaling, and networking. It uses pods to group containers, deployments to manage pods, and services for exposing applications.
JEEConf 2017 - The hitchhiker’s guide to Java class reloadingAnton Arhipov
In Java, a typical workflow involves restarting the application (almost) with every class change. For some applications it is not a problem at all, for some – it is a disaster.
From HotSwap to agent-based reloading. In this session, we are going to take a look at the options available for Java class reloading. There is plenty of tools that you can use for this task: rely on standard JVM HotSwap, redesign your application to rely on dynamic class loaders, to comprehend the Zen of OSGi, or to integrate a reloading agent. Every option has its own drawbacks and benefits and we’re going to take a deep dive on the subject.
Finally, there are also the conceptual challenges in reloading Java classes. What to do with the state? What should happen with the static initialisers? What if super class changes? Join this session to gain a better understanding of class reloading technologies and become more productive Java developer.
Rapid application development techniques, favoring rapid prototyping over intensive planning, have become popular in the last few years. Although the "old-school" Java Web frameworks (such as Struts and JSF) are well suited for enterprise projects, their development cycle is often too slow and complicated for prototyping. Due to their nature, dynamic languages such as Ruby, Python, and Groovy are natural for fast prototyping and scaffolding. But is there a way to benefit the Java ecosystem without compromising simplicity and productivity? This presentation tries to answer this question by comparing, head-to-head, three leading Java RAD tools—SeamForge, Play, and Roo—by writing a full-blown Web application in each of them, comparing the pros and cons along the way.
How Does Kubernetes Build OpenAPI Specifications?reallavalamp
The document discusses how Kubernetes generates OpenAPI specifications from its resource model. It involves a multi-phase process: (1) A code generator compiles Kubernetes API definitions and documentation comments into a Go file defining the OpenAPI schema; (2) At runtime, additional information like supported verbs is added to construct the full specification; (3) Specs can be merged and filtered as needed. The spec is then used to generate clients and for discovery purposes like caching in kubectl. Future work could involve declaring more validation rules and defaults in the resource definitions.
My talk at the @media Ajax conference in London in November 2007 about the non-technical steps you can take to make JavaScript and Ajax work for larger teams.
Invited talk on "why altmetrics?" at the information day "Bibliometrics, Scientometrics & Alternative metrics: which tools for which strategies?”, Association des directeurs et personnels de direction des bibliothèques universitaires et de la documentation (ADBU), 1st April 2015, BULAC, France (Paris)
Дмитрий Демчук. Кроссплатформенный краш-репортSergey Platonov
Доклад будет посвящен возможностям библиотеки Google Breakpad по созданию краш-репорта. Посмотрим как это работает изнутри.
На примерах будут рассмотрены способы интеграции библиотеки на разных платформах Windows, Linux, Max OS.
This document describes the implementation of a simple REST server in Qt using reflection. It discusses how the Qt meta-object compiler (moc) is used, the abstract and concrete server classes, building the route tree using reflection, handling new connections in worker threads, calling methods based on the request, and using reflection for testing. The abstract server class inherits from QTcpServer and uses slots decorated with tags to implement routes. Worker threads handle individual connections and parse requests to call the appropriate method. Reflection is leveraged throughout to build routes and dispatch requests without explicit registration or mapping.
Groovy is a dynamic programming language that runs on the JVM and seamlessly interacts with Java. Grails melds the concept of "Convention over Configuration" and the dynamic power of Groovy to create a framework that greatly simplifies the development of web based applications. This slideshow explores the two - dive into some Groovy vs. Java code examples and see some examples of Grails. We'll also discuss when to introduce either into an existing (or greenfield) environment and where they have worked and where they have failed
Java 9 introduces modules to the Java programming language and its runtime. Despite this feature being optional, due to the modularization of the standard library existing applications might behave differently when running on a version 9 JVM. Furthermore, because of changes in the runtime, existing libraries and frameworks might not yet correctly process your modularized code. As a result, updating to a Java 9 VM and taking Java 9 into brings its challanges.
This talk discusses the practical implications of module boundaries and analyzes new limitations Java 9 imposes on the reflection API. This talk explains how reflection is used in popular frameworks like Spring and Hibernate and explains why existing applications might break or change their behavior when facing modularized code. Finally, this talk showcases alternatives to now failing Java programming patterns and weights their robustness with regard to the Java releases 10 and upward.
The presenter is an active contributor to open source and helped to migrate many popular Java libraries to supporting Java 9. As a consequence, he as been working with Java 9 for almost two years.
The document describes the development of a C++ wrapper class for the C libcurl library. It defines a curl::easy class that encapsulates a CURL handle and provides methods like set_url() and perform() to set options and execute requests. Over time, the class is refined to add functionality, handle different string types more generically, and improve exception safety. Template classes are introduced to represent C strings in a more object-oriented way.
This document discusses how debugger modules and plugins like Byakugan can help speed up the basic exploit development process. It provides an example using Byakugan to develop an exploit for a vulnerability in BlazeDVD in just one crash. Byakugan is loaded in WinDbg and used to find the offset to EIP when triggering the crash with a Metasploit pattern, identifying it as an SEH exploit. Byakugan's searchOpcode function finds a suitable pop pop ret, which is then used to build the exploit payload to launch calc.exe and demonstrate successful exploitation in a single run.
JavaScript: Advanced Scoping & Other PuzzlesSencha
In this session, we'll review the fundamentals of Javascript variable scope and common "execution context" (scope) challenges associated with early/late binding of event handlers, specifically within complex Ext JS layouts. We'll also bring several patterns (namespaced references, Function closures, inline references, ref/refOwner, and the "Poor-man's message bus") to bear on the bowl of soup we call "scope."
RxJava is a library for composing asynchronous and event-based programs using observable sequences. It allows avoiding callback hell and makes it easy to compose and transform asynchronous processes through combining, filtering, etc. RxJava uses Observables to represent asynchronous data streams and allows subscribing to those streams using Observers. It supports asynchronous operations through Schedulers and can integrate with libraries like Retrofit to handle asynchronous network requests in a reactive way. Learning the RxJava concepts and operators takes some time but it provides many benefits for managing asynchronous code in a declarative way.
Android Nâng cao-Bài 9-Debug in Android Application Development Phuoc Nguyen
This document discusses various debugging tools and techniques for Android application development. It describes the Android Debug Bridge (ADB) for communicating with an emulator or device. It also covers the Dalvik Debug Monitor Server (DDMS) for monitoring heap usage, threads, and more. Specific tools covered include Hierarchy Viewer for debugging layouts, Traceview for method profiling, and jhat for heap profiling. It also discusses handling ANRs, StrictMode for catching errors, and debugging tips like using logcat and Dev Tools.
Hybrid development using Qt WebKit allows developers to embed a fully functional web browser inside a Qt application. Qt WebKit provides a bridge between Qt and the WebKit rendering engine, allowing developers to load web content, manipulate web pages, and integrate their applications with web services. Developers can inject QObjects into web pages to expose slots, properties, and signals to JavaScript, and can also call JavaScript functions and extract their return values from the C++ side.
This document discusses concurrency and threading in Java and Haskell. It covers:
1) Threads allow concurrent programs to perform multiple tasks simultaneously through time-slicing, though execution is not truly simultaneous.
2) Java threads can be created by extending Thread or implementing Runnable. Haskell uses forkIO to spawn concurrent threads.
3) Shared memory access requires synchronization to prevent race conditions. Solutions include locking (synchronized in Java), STM transactions in Haskell.
Unit testing without Robolectric, Droidcon Berlin 2016Danny Preussler
Are you bound to flaky, slow Robolectric Tests? Do you want to know a way out of it? This session shows ideas and concepts to replace Robolectric from your test code base
Making Exceptions on Exception Handling (WEH 2012 Keynote Speech)Tao Xie
The document describes an approach called CAR-Miner for mining sequence association rules from software repositories to detect defects in exception handling. CAR-Miner constructs exception flow graphs from code examples, generates static traces, and mines sequence association rules of the form (context) Λ (trigger) => (recovery). It detects violations by checking if context sequences match rule contexts before missing recoveries. An evaluation on open source projects found that over 50% of mined rules represented real patterns, CAR-Miner detected more defects than previous approaches, and sequence rules helped uncover new defects.
This document summarizes key aspects of Java servlets including:
- The servlet lifecycle which includes initialization, service, and destruction phases.
- How servlets handle HTTP requests through methods like doGet() and doPost().
- How servlets can communicate with other components using various protocols beyond just HTTP.
- How servlet contexts allow servlets to share information and resources.
- How servlets can create, read, and modify cookies to maintain state across requests.
Software Testing - Invited Lecture at UNSW Sydneyjulien.ponge
This document provides an overview of software testing concepts and the JUnit testing framework. It discusses the importance of testing, different types of testing, unit testing with JUnit, best practices for writing tests, integrating tests into builds with Ant and Maven, and logging. Examples of JUnit tests are also provided. The key points covered are:
- Why testing is important to find bugs, prevent regressions, and allow for refactoring
- Unit testing, functional testing, and other types of testing
- How to write automated unit tests with JUnit
- Best practices like testing edge cases, achieving good code coverage
- Integrating tests into builds with Ant and Maven
- Using logging frameworks like Log
The document discusses various Kubernetes concepts including pods, deployments, services, ingress, labels, health checks, config maps, secrets, volumes, autoscaling, resource quotas, namespaces, Helm, and the Kubernetes Dashboard. Kubernetes is a container orchestration tool that manages container deployment, scaling, and networking. It uses pods to group containers, deployments to manage pods, and services for exposing applications.
JEEConf 2017 - The hitchhiker’s guide to Java class reloadingAnton Arhipov
In Java, a typical workflow involves restarting the application (almost) with every class change. For some applications it is not a problem at all, for some – it is a disaster.
From HotSwap to agent-based reloading. In this session, we are going to take a look at the options available for Java class reloading. There is plenty of tools that you can use for this task: rely on standard JVM HotSwap, redesign your application to rely on dynamic class loaders, to comprehend the Zen of OSGi, or to integrate a reloading agent. Every option has its own drawbacks and benefits and we’re going to take a deep dive on the subject.
Finally, there are also the conceptual challenges in reloading Java classes. What to do with the state? What should happen with the static initialisers? What if super class changes? Join this session to gain a better understanding of class reloading technologies and become more productive Java developer.
Rapid application development techniques, favoring rapid prototyping over intensive planning, have become popular in the last few years. Although the "old-school" Java Web frameworks (such as Struts and JSF) are well suited for enterprise projects, their development cycle is often too slow and complicated for prototyping. Due to their nature, dynamic languages such as Ruby, Python, and Groovy are natural for fast prototyping and scaffolding. But is there a way to benefit the Java ecosystem without compromising simplicity and productivity? This presentation tries to answer this question by comparing, head-to-head, three leading Java RAD tools—SeamForge, Play, and Roo—by writing a full-blown Web application in each of them, comparing the pros and cons along the way.
How Does Kubernetes Build OpenAPI Specifications?reallavalamp
The document discusses how Kubernetes generates OpenAPI specifications from its resource model. It involves a multi-phase process: (1) A code generator compiles Kubernetes API definitions and documentation comments into a Go file defining the OpenAPI schema; (2) At runtime, additional information like supported verbs is added to construct the full specification; (3) Specs can be merged and filtered as needed. The spec is then used to generate clients and for discovery purposes like caching in kubectl. Future work could involve declaring more validation rules and defaults in the resource definitions.
My talk at the @media Ajax conference in London in November 2007 about the non-technical steps you can take to make JavaScript and Ajax work for larger teams.
Invited talk on "why altmetrics?" at the information day "Bibliometrics, Scientometrics & Alternative metrics: which tools for which strategies?”, Association des directeurs et personnels de direction des bibliothèques universitaires et de la documentation (ADBU), 1st April 2015, BULAC, France (Paris)
Good For Nothing UXD Update - General Assembly ProjectCraig Adams
Good For Nothing is a global community of over 3,600 marketing and communications volunteers who donate their skills to help local social enterprises. On weekends, volunteers attend events to work on tasks for enterprises in need. However, the website lacks clarity around how GFN works and fails to capture the richness of offline experiences. Research found confusing language, limited inspiring stories, and outdated content. Comparisons showed sites that clearly communicate benefits and ways to get involved are more effective.
This document provides an overview of various user experience techniques used to test and design interfaces. It describes techniques such as usability testing, prototyping, card sorting, contextual inquiry, moodboard testing, persona development, user diaries, expert review, and A/B testing. The document explains what each technique involves and variations of common techniques.
Enabling Self Service Business Intelligenceusing ExcelAlan Koo
This document discusses enabling self-service business intelligence using Excel. It introduces Power BI tools for Excel like Power Query for discovering and combining data from various sources. Power Pivot is for modeling and analyzing data in Excel using DAX. Power View and Power Map enable interactive visualizations. The presentation provides demonstrations of using these tools to clean, model and visualize sample sales data to gain insights. It highlights how Excel users can leverage familiar tools for self-service BI.
What advertisers can steal from the world of UX and Design to arrive at better solutions, faster. A talk that myself and Ian Swanson, Design Head at Coca-Cola APAC, gave to APG members in Sydney.
This document provides an overview of object-oriented concepts in JavaScript. It defines JavaScript and its components like ECMAScript, DOM, and BOM. It discusses how JavaScript supports object-oriented programming features like polymorphism and inheritance through prototypal inheritance despite not being a classical OOP language. The document also covers JavaScript data types, objects, scope, closures, context, and methods for changing contexts like call and apply.
JavaScript is evolving with the addition of modules, platform consistency, and harmony features. Modules allow JavaScript code to be organized and avoid naming collisions. CommonJS and AMD module formats are used widely. Platform consistency is improved through polyfills that mimic future APIs for older browsers. Harmony brings language-level modules and features like destructuring assignment, default parameters, and promises to JavaScript. Traceur compiles Harmony code to existing JavaScript.
Intro to ES6 and why should you bother !Gaurav Behere
The presentation walks you through the latest changes in JavaScript, that came as a part of ES6 recommendations.
Intro to few new changes suggested & why should we as JS developer, bother.
Ob1k is a new open source RPC container. it belongs to a new breed of frameworks that tries to improve on the classic J2EE model by embedding the server and reducing redundant bloatware. Ob1k supports two modes of operations: sync and async, the async mode aims for maximum performance by adopting reactive principals like using non-blocking code and functional composition using futures. Ob1k also aims to be ops/devops friendly by being self contained and easily configured.
The document provides an introduction to JavaScript and jQuery. It discusses what JavaScript and jQuery are, how to add them to web pages, and basic syntax and concepts for both languages. It also covers selecting elements with jQuery, attaching events to elements, and responding to events by performing actions. The document is intended to teach the basics of JavaScript and get readers started with jQuery.
JavaScript basics
JavaScript event loop
Ajax and promises
DOM interaction
JavaScript object orientation
Web Workers
Useful Microframeworks
This presentation has been developed in the context of the Mobile Applications Development course, DISIM, University of L'Aquila (Italy), Spring 2016.
http://www.ivanomalavolta.com
The document provides an overview of the Prototype JavaScript framework and its support for Ajax functionality. It discusses topics like installing Prototype, the Ajax.Request, Ajax.Updater, and Ajax.PeriodicalUpdater objects, handling JSON data, and comparing Prototype's Ajax support to other libraries like jQuery, Dojo and Ext JS. It also provides examples of using Prototype for Ajax requests and updating HTML elements.
The document provides an overview of the Prototype JavaScript framework and its support for Ajax functionality. It discusses topics like installing Prototype, the Ajax.Request, Ajax.Updater, and Ajax.PeriodicalUpdater objects, handling JSON data, and comparing Prototype's Ajax support to other libraries like jQuery, Dojo and Ext JS. It also provides examples of using Prototype for Ajax requests and updating HTML elements.
The document provides an overview of JavaScript, covering what it is, its basics, functions, objects, prototypes, scope, asynchronous JavaScript, JSON, debugging tools, performance, events, error handling, and the future of JavaScript. It discusses that JavaScript is an object-oriented scripting language used in web pages that is not tied to specific browsers but makes use of the DOM, BOM, and ECMAScript standards. It also summarizes some of JavaScript's core features like functions, objects, prototypes, and more.
The document summarizes Guillaume Laforge's background and expertise in Groovy and JVM technologies. It then provides an overview of the rich Groovy ecosystem, including frameworks like Grails and Griffon for building applications, GPars for concurrency, and tools for testing, building projects, and interacting with web services. Specific examples are given of how to create a simple console application in Griffon and use various concurrency abstractions in GPars.
This document provides an overview of Firefox extension development using JavaScript. It discusses JavaScript basics like variables, functions, and debugging with alerts. It also covers how to access and manipulate the DOM to work with XUL elements in the extension's GUI. Developers are instructed to place JavaScript code files in the extension's content directory and link them to XUL files using the chrome URI. Further reading links are included to learn more about XUL elements and JavaScript.
This document provides an overview of Firefox extension development using JavaScript. It discusses JavaScript basics like variables, functions, and debugging with alerts. It also covers how to access and manipulate the DOM to work with XUL elements in a GUI. Developers are instructed to place JavaScript code files in the extension's content directory and link them to XUL files using the chrome URI. Further reading links are included to learn more about XUL elements, JavaScript, and tutorials for non-programmers.
JavaScript basics
JavaScript event loop
Ajax and promises
DOM interaction
JavaScript object orientation
Web Workers
Useful Microframeworks
This presentation has been developed in the context of the Mobile Applications Development course, DISIM, University of L'Aquila (Italy), Spring 2015.
http://www.ivanomalavolta.com
The document discusses several tools for JavaScript development including:
1. ECMAScript 6 for new JavaScript features, Visual Studio Code for editing, and Node.js & npm for modules.
2. Build tools like webpack, Babel, and UglifyJS to bundle, transpile, and minimize code.
3. Testing with Jasmine and debugging with Chrome Developer Tools and source maps.
4. Documentation generation with YUIDoc.
A demo project is provided at https://github.com/simonkim/jstools-demo to show how to use these tools together in a workflow.
The document discusses the challenges and rewards of developing a large JavaScript application with over 120,000 lines of code. It describes the Xopus XML editor framework, including its object-oriented architecture, class loading system, and techniques for improving performance like asynchronous execution and lazy loading of components. The framework aims to provide an application development structure for JavaScript applications in a similar way that Java and C# frameworks work.
The document discusses Node.js, which is a server-side JavaScript environment that uses an asynchronous event-driven model. Some key points:
- Node.js uses the V8 JavaScript engine and allows handling requests via JavaScript on the server-side rather than a separate language like PHP, Java, etc.
- It has non-blocking I/O to avoid blocking the entire process when waiting for slow resources like files or databases. Callbacks are used to handle asynchronous operations.
- The document discusses how Node.js could provide access to MUMPS databases to take advantage of the benefits of global storage while using the popular JavaScript language.
This document outlines an agenda for a workshop on modern frontend development with React.js. It begins with setup instructions for installing Node.js and cloning a GitHub repository. The agenda then covers ES6 features like arrow functions, classes, and modules. It discusses tools like Babel, Webpack, and React. It introduces Flux architecture and Redux for unidirectional data flow and state management. Finally, it suggests next steps and provides references to sample code and the workshop presenter's contact information.
2. JavaScript ≠ Java
● Developed in 1995/96 by Netscape
● No technological relation to Java
● Originally named LiveScript, but renamed to JavaScript
for marketing purposes (Java hype in the mid-90s)
● Standardized as ECMAScript (ECMA-262) in 1998
● Very small object and instruction set → efficient
● Runs in a sandbox
● Manipulation of HTML documents via DOM
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4. Syntax 1/2
if (condition) { while (condition) {
instructions; instructions;
} else { }
instructions;
} do {
instructions;
switch (variable) { } while (condition);
case value1 : instructions;
break; for (start; end-condition; iterator){
case value2 : instructions; instuctions;
break; }
default : instructions;
} for (var element in object) {
instructions;
}
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5. Syntax 2/2
function a (p1, p2, p2) { function CompleteClass (parameter)
instructions; {
return value; var private_attribute = "private";
}
this.public_attribute = "public";
var b = function (...) {...}
var private_method = function () {
// do something
function MyClass(x){ };
this.attribute1 = x;
} this.public_method = function () {
// do something public
var object1 = new MyClass(10); };
window.alert(object1.attribute1); }
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6. JavaScript is 100% dynamic
var my_object;
my_object.new_attr = 1; // create new attributes and methods on runtime
// or
my_object["other_new_attr"] = 2;
// and remove them on runtime
delete my_object.other_new_attr;
// or even the whole thing...
delete my_object;
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7. Handling Exceptions
// kind of similar to Java
try {
// do stuff...
} catch(exception) {
// ATENTION! JavaScript is untyped and therefore there are no diffrent
// exception types like in Java. You have to distinguish the exceptions by hand
} finally {
// optional
};
throw("A sample exception"); // throw exceptions
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8. Predefined Objects
● Object: general class, from which all objects are derived
● Function: class for functions
● Array: array-class
● String: string-class
● Boolean: class for boolean values
● Number: class for all kinds of numbers (IEEE 754)
● Math: provides static mathods for mathematical functions
● Date: for date and time operations and values
● RegExp: for regular expressions
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9. Other Helpful Stuff
window.alert("Hello World");
var confirmed = window.confirm("Confirm please");
var answer = window.prompt("Your answer:", "42");
http://de.selfhtml.org/javascript/objekte/window.htm
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10. DOM – Document Object Model
<html>
<header>...</header>
<body>
<img src="some_image.png">
<img src="image2.png">
<img src="image3.jpg">
<script>
window.alert(document.images[0].height);
if(document.images[1].height >
document.images[2].height) window.alert("Image2");
else window.alert("Image3");
</script>
</body>
</html>
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11. DOM – more practical (but dirty)
<html><header>...</header>
<body>
<h1 id="my_header">A title</h1>
<input type="button" onklick="change_header()">
<script>
function change_header() {
document.getElementById("my_header").innerHTML = "My new title";
}
</script>
</body>
</html>
http://de.selfhtml.org/javascript/objekte/document.htm
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12. AJAX
Asynchronous JavaScript And XML
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14. Plain AJAX 2/2
...
if (xmlHttp) {
xmlHttp.open('GET', 'example.xml', true);
xmlHttp.onreadystatechange = function () {
if (xmlHttp.readyState == 4) {
alert(xmlHttp.responseText);
}
};
xmlHttp.send(null);
}
</script>
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15. Practical AJAX
e.g. in 'Prototype'
var myAjax = new Ajax.Request(
"/server_date.php",
{ method: 'get', onComplete: show_date }
);
function show_date( originalRequest ) {
document.getElementById('output').innerHTML =
originalRequest.responseText;
}
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16. AJAX Frameworks
● Prototype: prototypejs.org
● jQuery: jquery.com
● MooTools: mootools.net
● and many more...
● Specially for graphical effects:
● script.aculo.us (needs Prototype)
● Moo.fx
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17. AJAX Frameworks
Enhancing JavaScript
i.e. document.getElementById("element_id")
→ $("element_id")
Example changing color of an element:
$("element_id").setStyle({color: '#ff0000'}); // Protoype
$("#my_div").css("border","3px solid red"); // jQuery
var div_text_color = $("#my_div").css("color");
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18. Demo
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19. Questions?
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20. Thank You.
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