- JavaScript was created in 1995 by Brandon Eich and was originally called LiveScript. It was renamed to JavaScript to capitalize on the popularity of Java, though the two languages are unrelated.
- JavaScript is an interpreted, prototype-based scripting language that is commonly used for client-side web development but can also be used for server-side applications and other programs. It has dynamic typing and supports functions as first-class objects.
- The document discusses JavaScript syntax including variables, numbers, strings, comments, control flow statements like if/else and loops, and functions. It also covers the Rhino runtime environment for running JavaScript without a browser.
Introduction to web programming for java and c# programmers by @drpicoxDavid Rodenas
(better presented by @drpicox)
Slides of an introductory course for web programming focusing in basic Javascript and CSS concepts. It assumes knowledge of programming, Java or C#.
Introduction to web programming for java and c# programmers by @drpicoxDavid Rodenas
(better presented by @drpicox)
Slides of an introductory course for web programming focusing in basic Javascript and CSS concepts. It assumes knowledge of programming, Java or C#.
Game Design and Development Workshop Day 1Troy Miles
This course teaches you how to build awesome video games using Cocos2Dx. Cocos2Dx is a feature packed, free game development engine. It is cross platform, high performance, and supports three languages: C++, Lua and JavaScript. With it, you can write games for iOS, Android, Windows, Mac, and the Web. It is nothing short of amazing and this course teaches you how to use it. We will program Cocos2Dx in JavaScript, but this is not a programming class. If you don't know how to write code in JavaScript or some other curly brace language, this is not the course for you. For those whose JavaScript is rusty, we will do quick language overview. Don't let the JavaScript part fool you. Cocos2Dx is built from highly optimized C++ and OpenGL, JavaScript is used for game logic, not graphics. Our games will run at a super fast, 60 frames a second.
JavaScript - Chapter 4 - Types and StatementsWebStackAcademy
A computer program is a list of "instructions" to be "executed" by a computer.
In a programming language, these programming instructions are called statements.
A JavaScript program is a list of programming statements.
JavaScript statements are composed of:
Values, Operators, Expressions, Keywords, and Comments.
This statement tells the browser to write "Hello Dolly." inside an HTML element with id="demo":
JavaScript Data Types
JavaScript variables can hold many data types: numbers, strings, objects and more.
In programming, data types is an important concept.
To be able to operate on variables, it is important to know something about the type.
Large Language Models and the End of ProgrammingMatt Welsh
Talk by Matt Welsh at Craft Conference 2024 on the impact that Large Language Models will have on the future of software development. In this talk, I discuss the ways in which LLMs will impact the software industry, from replacing human software developers with AI, to replacing conventional software with models that perform reasoning, computation, and problem-solving.
Providing Globus Services to Users of JASMIN for Environmental Data AnalysisGlobus
JASMIN is the UK’s high-performance data analysis platform for environmental science, operated by STFC on behalf of the UK Natural Environment Research Council (NERC). In addition to its role in hosting the CEDA Archive (NERC’s long-term repository for climate, atmospheric science & Earth observation data in the UK), JASMIN provides a collaborative platform to a community of around 2,000 scientists in the UK and beyond, providing nearly 400 environmental science projects with working space, compute resources and tools to facilitate their work. High-performance data transfer into and out of JASMIN has always been a key feature, with many scientists bringing model outputs from supercomputers elsewhere in the UK, to analyse against observational or other model data in the CEDA Archive. A growing number of JASMIN users are now realising the benefits of using the Globus service to provide reliable and efficient data movement and other tasks in this and other contexts. Further use cases involve long-distance (intercontinental) transfers to and from JASMIN, and collecting results from a mobile atmospheric radar system, pushing data to JASMIN via a lightweight Globus deployment. We provide details of how Globus fits into our current infrastructure, our experience of the recent migration to GCSv5.4, and of our interest in developing use of the wider ecosystem of Globus services for the benefit of our user community.
Game Design and Development Workshop Day 1Troy Miles
This course teaches you how to build awesome video games using Cocos2Dx. Cocos2Dx is a feature packed, free game development engine. It is cross platform, high performance, and supports three languages: C++, Lua and JavaScript. With it, you can write games for iOS, Android, Windows, Mac, and the Web. It is nothing short of amazing and this course teaches you how to use it. We will program Cocos2Dx in JavaScript, but this is not a programming class. If you don't know how to write code in JavaScript or some other curly brace language, this is not the course for you. For those whose JavaScript is rusty, we will do quick language overview. Don't let the JavaScript part fool you. Cocos2Dx is built from highly optimized C++ and OpenGL, JavaScript is used for game logic, not graphics. Our games will run at a super fast, 60 frames a second.
JavaScript - Chapter 4 - Types and StatementsWebStackAcademy
A computer program is a list of "instructions" to be "executed" by a computer.
In a programming language, these programming instructions are called statements.
A JavaScript program is a list of programming statements.
JavaScript statements are composed of:
Values, Operators, Expressions, Keywords, and Comments.
This statement tells the browser to write "Hello Dolly." inside an HTML element with id="demo":
JavaScript Data Types
JavaScript variables can hold many data types: numbers, strings, objects and more.
In programming, data types is an important concept.
To be able to operate on variables, it is important to know something about the type.
Large Language Models and the End of ProgrammingMatt Welsh
Talk by Matt Welsh at Craft Conference 2024 on the impact that Large Language Models will have on the future of software development. In this talk, I discuss the ways in which LLMs will impact the software industry, from replacing human software developers with AI, to replacing conventional software with models that perform reasoning, computation, and problem-solving.
Providing Globus Services to Users of JASMIN for Environmental Data AnalysisGlobus
JASMIN is the UK’s high-performance data analysis platform for environmental science, operated by STFC on behalf of the UK Natural Environment Research Council (NERC). In addition to its role in hosting the CEDA Archive (NERC’s long-term repository for climate, atmospheric science & Earth observation data in the UK), JASMIN provides a collaborative platform to a community of around 2,000 scientists in the UK and beyond, providing nearly 400 environmental science projects with working space, compute resources and tools to facilitate their work. High-performance data transfer into and out of JASMIN has always been a key feature, with many scientists bringing model outputs from supercomputers elsewhere in the UK, to analyse against observational or other model data in the CEDA Archive. A growing number of JASMIN users are now realising the benefits of using the Globus service to provide reliable and efficient data movement and other tasks in this and other contexts. Further use cases involve long-distance (intercontinental) transfers to and from JASMIN, and collecting results from a mobile atmospheric radar system, pushing data to JASMIN via a lightweight Globus deployment. We provide details of how Globus fits into our current infrastructure, our experience of the recent migration to GCSv5.4, and of our interest in developing use of the wider ecosystem of Globus services for the benefit of our user community.
Climate Science Flows: Enabling Petabyte-Scale Climate Analysis with the Eart...Globus
The Earth System Grid Federation (ESGF) is a global network of data servers that archives and distributes the planet’s largest collection of Earth system model output for thousands of climate and environmental scientists worldwide. Many of these petabyte-scale data archives are located in proximity to large high-performance computing (HPC) or cloud computing resources, but the primary workflow for data users consists of transferring data, and applying computations on a different system. As a part of the ESGF 2.0 US project (funded by the United States Department of Energy Office of Science), we developed pre-defined data workflows, which can be run on-demand, capable of applying many data reduction and data analysis to the large ESGF data archives, transferring only the resultant analysis (ex. visualizations, smaller data files). In this talk, we will showcase a few of these workflows, highlighting how Globus Flows can be used for petabyte-scale climate analysis.
In software engineering, the right architecture is essential for robust, scalable platforms. Wix has undergone a pivotal shift from event sourcing to a CRUD-based model for its microservices. This talk will chart the course of this pivotal journey.
Event sourcing, which records state changes as immutable events, provided robust auditing and "time travel" debugging for Wix Stores' microservices. Despite its benefits, the complexity it introduced in state management slowed development. Wix responded by adopting a simpler, unified CRUD model. This talk will explore the challenges of event sourcing and the advantages of Wix's new "CRUD on steroids" approach, which streamlines API integration and domain event management while preserving data integrity and system resilience.
Participants will gain valuable insights into Wix's strategies for ensuring atomicity in database updates and event production, as well as caching, materialization, and performance optimization techniques within a distributed system.
Join us to discover how Wix has mastered the art of balancing simplicity and extensibility, and learn how the re-adoption of the modest CRUD has turbocharged their development velocity, resilience, and scalability in a high-growth environment.
Paketo Buildpacks : la meilleure façon de construire des images OCI? DevopsDa...Anthony Dahanne
Les Buildpacks existent depuis plus de 10 ans ! D’abord, ils étaient utilisés pour détecter et construire une application avant de la déployer sur certains PaaS. Ensuite, nous avons pu créer des images Docker (OCI) avec leur dernière génération, les Cloud Native Buildpacks (CNCF en incubation). Sont-ils une bonne alternative au Dockerfile ? Que sont les buildpacks Paketo ? Quelles communautés les soutiennent et comment ?
Venez le découvrir lors de cette session ignite
A Comprehensive Look at Generative AI in Retail App Testing.pdfkalichargn70th171
Traditional software testing methods are being challenged in retail, where customer expectations and technological advancements continually shape the landscape. Enter generative AI—a transformative subset of artificial intelligence technologies poised to revolutionize software testing.
Gamify Your Mind; The Secret Sauce to Delivering Success, Continuously Improv...Shahin Sheidaei
Games are powerful teaching tools, fostering hands-on engagement and fun. But they require careful consideration to succeed. Join me to explore factors in running and selecting games, ensuring they serve as effective teaching tools. Learn to maintain focus on learning objectives while playing, and how to measure the ROI of gaming in education. Discover strategies for pitching gaming to leadership. This session offers insights, tips, and examples for coaches, team leads, and enterprise leaders seeking to teach from simple to complex concepts.
Enhancing Project Management Efficiency_ Leveraging AI Tools like ChatGPT.pdfJay Das
With the advent of artificial intelligence or AI tools, project management processes are undergoing a transformative shift. By using tools like ChatGPT, and Bard organizations can empower their leaders and managers to plan, execute, and monitor projects more effectively.
Globus Connect Server Deep Dive - GlobusWorld 2024Globus
We explore the Globus Connect Server (GCS) architecture and experiment with advanced configuration options and use cases. This content is targeted at system administrators who are familiar with GCS and currently operate—or are planning to operate—broader deployments at their institution.
Unleash Unlimited Potential with One-Time Purchase
BoxLang is more than just a language; it's a community. By choosing a Visionary License, you're not just investing in your success, you're actively contributing to the ongoing development and support of BoxLang.
Software Engineering, Software Consulting, Tech Lead.
Spring Boot, Spring Cloud, Spring Core, Spring JDBC, Spring Security,
Spring Transaction, Spring MVC,
Log4j, REST/SOAP WEB-SERVICES.
AI Pilot Review: The World’s First Virtual Assistant Marketing SuiteGoogle
AI Pilot Review: The World’s First Virtual Assistant Marketing Suite
👉👉 Click Here To Get More Info 👇👇
https://sumonreview.com/ai-pilot-review/
AI Pilot Review: Key Features
✅Deploy AI expert bots in Any Niche With Just A Click
✅With one keyword, generate complete funnels, websites, landing pages, and more.
✅More than 85 AI features are included in the AI pilot.
✅No setup or configuration; use your voice (like Siri) to do whatever you want.
✅You Can Use AI Pilot To Create your version of AI Pilot And Charge People For It…
✅ZERO Manual Work With AI Pilot. Never write, Design, Or Code Again.
✅ZERO Limits On Features Or Usages
✅Use Our AI-powered Traffic To Get Hundreds Of Customers
✅No Complicated Setup: Get Up And Running In 2 Minutes
✅99.99% Up-Time Guaranteed
✅30 Days Money-Back Guarantee
✅ZERO Upfront Cost
See My Other Reviews Article:
(1) TubeTrivia AI Review: https://sumonreview.com/tubetrivia-ai-review
(2) SocioWave Review: https://sumonreview.com/sociowave-review
(3) AI Partner & Profit Review: https://sumonreview.com/ai-partner-profit-review
(4) AI Ebook Suite Review: https://sumonreview.com/ai-ebook-suite-review
Exploring Innovations in Data Repository Solutions - Insights from the U.S. G...Globus
The U.S. Geological Survey (USGS) has made substantial investments in meeting evolving scientific, technical, and policy driven demands on storing, managing, and delivering data. As these demands continue to grow in complexity and scale, the USGS must continue to explore innovative solutions to improve its management, curation, sharing, delivering, and preservation approaches for large-scale research data. Supporting these needs, the USGS has partnered with the University of Chicago-Globus to research and develop advanced repository components and workflows leveraging its current investment in Globus. The primary outcome of this partnership includes the development of a prototype enterprise repository, driven by USGS Data Release requirements, through exploration and implementation of the entire suite of the Globus platform offerings, including Globus Flow, Globus Auth, Globus Transfer, and Globus Search. This presentation will provide insights into this research partnership, introduce the unique requirements and challenges being addressed and provide relevant project progress.
Enterprise Resource Planning System includes various modules that reduce any business's workload. Additionally, it organizes the workflows, which drives towards enhancing productivity. Here are a detailed explanation of the ERP modules. Going through the points will help you understand how the software is changing the work dynamics.
To know more details here: https://blogs.nyggs.com/nyggs/enterprise-resource-planning-erp-system-modules/
Understanding Globus Data Transfers with NetSageGlobus
NetSage is an open privacy-aware network measurement, analysis, and visualization service designed to help end-users visualize and reason about large data transfers. NetSage traditionally has used a combination of passive measurements, including SNMP and flow data, as well as active measurements, mainly perfSONAR, to provide longitudinal network performance data visualization. It has been deployed by dozens of networks world wide, and is supported domestically by the Engagement and Performance Operations Center (EPOC), NSF #2328479. We have recently expanded the NetSage data sources to include logs for Globus data transfers, following the same privacy-preserving approach as for Flow data. Using the logs for the Texas Advanced Computing Center (TACC) as an example, this talk will walk through several different example use cases that NetSage can answer, including: Who is using Globus to share data with my institution, and what kind of performance are they able to achieve? How many transfers has Globus supported for us? Which sites are we sharing the most data with, and how is that changing over time? How is my site using Globus to move data internally, and what kind of performance do we see for those transfers? What percentage of data transfers at my institution used Globus, and how did the overall data transfer performance compare to the Globus users?
3. 3
What is JavaScript?
• created in 1995 by Brandon Eich of Netscape/Mozilla
"JS had to "look like Java" only less so, be Java’s dumb kid brother or
boy-hostage sidekick. Plus, I had to be done in ten days or something
worse than JS would have happened." - Brandon Eich
originally called "LiveScript" to match Netscape branding
renamed to JavaScript to capitalize on popularity of Java
submitted as a standard to ECMA in 1997 as "ECMAScript"
• not directly related to Java
Eich claims he was most influenced by Self and Scheme
some JS syntax, libraries, etc. are ripped off by Java, C
D. Crockford: "JavaScript is Lisp in C's clothing."
4. 4
JavaScript today
• possibly the most used programming language today (!!)
mostly used for client-side web page scripting, but
increasingly used to build server apps, other programs
current standardized version: ECMAScript 5 (2009)
• Is JavaScript a bad programming language??
had bad browser behavior, slow, poor web coders, etc.
recent implementations are faster, better, more stable
JS in browser works with "DOM" (Document Object Model)
related JS+web technologies: Ajax, JSON, jQuery, etc.
spin-off languages: JScript (MS), ActionScript (Adobe), etc.
5. 5
JavaScript vs. Java
• interpreted, not compiled
dynamic typing
first-class functions; nested functions; closures
a structured, imperative object-oriented, scripting lang.
prototype-based object and inheritance system
sophisticated first-class resizable array type
first-class regular expression support
• more relaxed syntax and rules
fewer and "looser" data types
variables don't always need to be declared
key construct is first-class function rather than the class
+ = JavaScript
6. 6
Running JS code in a browser
<html>
<head>
<script src="myfile.js"
type="text/javascript"></script>
</head>
<body>
<p>My web page</p> ...
</body>
</html>
We won't be doing this!
– aside: Firebug extension
7. 7
Running JS without a browser
• CommonJS: project started in 2009 to create a standard
library of JS types and functions for all non-web apps
Rhino (Mozilla)
V8 (Google / Chrome)
Narwhal
others: Ringo, Joyent, Sprout, Persevere
• We support the Rhino runtime for this course.
http://www.mozilla.org/rhino/
java -jar rhino.jar JSFileName
10. 10
print (CommonJS)
print(expr, expr, ..., expr);
• provided by Rhino as part of CommonJS
print("Hello, world!n");
print(1+1, 4, 3*2); // 2 4 6
other shell variables/functions:
– arguments, environment, help, defineClass,
deserialize, load(filename), loadClass,
readFile(name), readURL, runCommand, seal,
serialize, spawn, sync, quit, version
doesn't work in web browsers (use alert instead)
11. 11
Variables
var name = expression;
• Examples:
var age = 32;
var weight = 127.4;
var clientName = "Connie Client";
• variables are declared with var keyword (case sensitive)
• types not specified, but JS does have types
Number, Boolean, String, Array, Object, Function,
Null, Undefined
can find out a variable's type by calling typeof
12. 12
Numbers
var enrollment = 99;
var medianGrade = 2.8;
var credits = 5 + 4 + (2 * 3);
• integers and real numbers are the same type
(no int vs. double)
• same operators: + - * / % ++ -- = += -= *= /= %=
similar precedence to Java
many operators auto-convert types: "2" * 3 is 6
13. 13
Number properties/methods
Number object "static" properties
Number.MAX_VALUE largest possible number, roughly 10308
Number.MIN_VALUE smallest positive number, roughly 10-324
Number.NaN Not-a-Number; result of invalid computations
Number.POSITIVE_INFINITY infinity; result of 1/0
Number.NEGATIVE_INFINITY negative infinity; result of -1/0
Number instance methods
.toString([base]) convert a number to a string with optional base
.toFixed(digits) fixed-point real with given # digits past decimal
.toExponential(digits) convert a number to scientific notation
.toPrecision(digits) floating-point real, given # digits past decimal
global methods related to numbers
isNaN(expr) true if the expression evaluates to NaN
isFinite(expr) true if expr is neither NaN nor an infinity
14. 14
The Math object
var rand1to10 = Math.floor(Math.random() * 10 + 1);
var three = Math.floor(Math.PI);
• Math methods: abs, ceil, cos, floor, log, max, min,
pow, random, round, sin, sqrt, tan
• properties: E, PI
15. 15
Math properties/methods
Math.E e, base of natural logarithms: 2.718...
Math.LN10, Math.LN2,
Math.LOG2E, Math.LOG10E
natural logarithm of 10 and 2;
logarithm of e in base 2 and base 10
Math.PI , circle's circumference/diameter: 3.14159...
Math.SQRT1_2, Math.SQRT2 square roots of 1/2 and 2
Math.abs(n) absolute value
Math.acos/asin/atan(n) arc-sin/cosine/tangent of angle in radians
Math.ceil(n) ceiling (rounds a real number up)
Math.cos/sin/tan(n) sin/cosine/tangent of angle in radians
Math.exp(n) en, e raised to the nth power
Math.floor(n) floor (rounds a real number down)
Math.log(n) natural logarithm (base e)
Math.max/min(a, b...) largest/smallest of 2 or more numbers
Math.pow(x, y) xy, x raised to the yth power
Math.random() random real number k in range 0 ≤ k < 1
Math.round(n) round number to nearest whole number
Math.sqrt(n) square root
17. 17
Strings
var s = "Connie Client";
var firstName = s.substring(0, s.indexOf(" "));
var len = s.length; // 13
var s2 = 'Melvin Merchant'; // can use "" or ''
• String methods: charAt, charCodeAt,
fromCharCode, indexOf, lastIndexOf, replace,
split, substring, toLowerCase, toUpperCase
charAt returns a one-letter string (there is no char type)
length is a property (not a method as in Java)
• concatenation with + : 1 + 1 is 2, but "1" + 1 is "11"
• strings can be compared with <, <=, ==, !=, >, >=
18. 18
String methods
String.fromCharCode(expr) converts ASCII integer → String
.charAt(index) returns character at index, as a String
.charCodeAt(index) returns ASCII value at a given index
.concat(str...) returns concatenation of string(s) to this one
.indexOf(str[,start])
.lastIndexOf(str[,start])
first/last index at which given string begins in
this string, optionally starting from given index
.match(regexp) returns any matches for this string against the
given string or regular expression ("regex")
.replace(old, new) replaces first occurrence of old string or regular
expr. with new string (use regex to replace all)
.search(regexp) first index where given regex occurs
.slice(start, end)
.substring(start, end)
substr. from start (inclusive) to end (exclusive)
.split(delimiter[,limit]) break apart a string into an array of strings
.toLowerCase()
.toUpperCase()
return new string in all upper/lowercase
19. 19
More about Strings and numbers
• escape sequences behave as in Java: ' " & n t
• convert string to number with parseInt, parseFloat:
var count = 10;
var s1 = "" + count; // "10"
var s2 = count + " bananas, ah ah ah!";
var n1 = parseInt("42 is the answer"); // 42
var n2 = parseInt("0x2A", 16); // 42
var n3 = parseFloat("3.1415"); // 3.1415
var bad = parseInt("booyah"); // NaN
• access the letters of a String with [] or charAt:
var firstLetter = s[0];
var firstLetter = s.charAt(0);
var lastLetter = s.charAt(s.length - 1);
20. 20
The for loop (same as Java)
for (initialization; test; update) {
statements;
}
for (var i = 0; i < 10; i++) {
print(i + "n");
}
var s1 = "hi, there!!!", s2 = "";
for (var i = 0; i < s1.length; i++) {
var c = s1.charAt(i);
if (c >= "a" && c <= "z") {
s2 += c + c;
}
}
// s2 stores "hhiitthheerree"
21. 21
Logical operators
> < >= <= && || ! == != === !==
• most logical operators automatically convert types:
5 < "7" is true
42 == 42.0 is true
"5.0" == 5 is true
• === , !== are strict equality tests; checks type and value
"5.0" === 5 is false
22. 22
The if/else statement
if (test) {
statements;
} else if (test) {
statements;
} else {
statements;
}
• identical structure to Java's if/else statement...
but JavaScript allows almost any value as a test!
23. 23
Boolean type
var iLike341 = true;
var ieIsGood = "IE6" > 0; // false
if ("JS is great") { ... } // true
if (0 || "") { ... } // false
• any value can be used as a test
"falsey" values: 0, 0.0, NaN, "", null, and undefined
"truthy" values: anything else
• converting a value into a boolean explicitly:
var boolValue = Boolean(otherValue);
var boolValue = !!(otherValue);
24. 24
&& and || in depth
• a && b is a binary operator that returns:
if a is truthy, then b, else a
(this turns out to be a truthy/falsey value in the right cases)
• a || b is a binary operator that returns:
if a is truthy, then a, else b
(this turns out to be a truthy/falsey value in the right cases)
• Examples:
0 || 42 || 12 || -1 returns 42 (truthy)
NaN || null || "" returns "" (falsey)
1 + 1 && 6 && 9 returns 9 (truthy)
3 && 4 && null && 5 && 6 returns null (falsey)
25. 25
null vs. undefined
var ned = null;
var benson = 9;
var caroline;
• at this point in the code:
ned is null
benson is 9
caroline is undefined
• undefined: has not been declared, does not exist
• null: exists, but specifically assigned an empty value
Why does JavaScript have both of these?
26. 26
The while loop (same as Java)
while (test) {
statements;
}
do {
statements;
} while (test);
• break and continue keywords also behave as in Java
27. 27
Functions
function name(paramName, ..., paramName) {
statements;
}
function myFunction(name) {
print("Hello, " + name + "!n");
print("How are you?n");
}
unlike in Java, functions are first-class (can be stored as
variables, passed as parameters, returned, ...)
28. 28
JavaScript keywords
break case catch continue debugger
default delete do else finally
for function if in instanceof
new return switch this throw
try typeof var void while
with
• Reserved words (these don't do anything yet):
class const enum export extends
import implements interface let package
private protected public static super yield