Come explore Elm, a functional programming language for making web things. Elm aims to solve some of the same problems that Ember, React, and Angular 2 solve, but in a radically different way. Strong and static typing ensures that data you pass around in your apps really is what you think it is. A simple and tried-and-true architecture makes it easy to understand, and great tooling makes it fun to use.
If you don't have knowledge of HTML, CSS & JavaScript than you may face some difficulties in validating a HTML form yet I will make the entire step very easy to understand by you.
If you don't have knowledge of HTML, CSS & JavaScript than you may face some difficulties in validating a HTML form yet I will make the entire step very easy to understand by you.
This Tutorial Cover HTML Forms input,select,textarea
Tutorial : http://sswebtricks.blogspot.in/2018/02/html-tutorial-topic-4.html
Video : https://www.youtube.com/watch?v=0mp7llEuZIA&t=461s
Source : https://github.com/hackstarsj/html-tutorial-topic-first
Web Visualization with HTML5, CSS3, and JavaScript is the course with the rapidly changing web development technologies, it has become important to stay in line with them to progress within the industry, which is why this course in web virtualization has been brought to you to spruce up your web designing and animating skills using HTML5, CSS3, and JavaScript. The latest features of HTML5, CSS3 and JavaScript are set to be provided to you through this course, hence, it is desired that you have basic knowledge on these programming languages for a smoother learning experience. This course will start off by walking you through the CSS3 virtualization techniques to design and animate webs. You will be taught how to create a 3D element using CSS transition and to transform animates into 2D and 3D, along with an insight into the elements of scalable vector graphics which is needed to create basic images and polygons and to animate. Our tutors will further take you through the canvas aspects of HTML5 to start drawing grids and animations using it. You will also get to learn how to create a callback and create and activate a queue that is needed in animating and the animation libraries that will be essential to your web designing projects. By the end of this course, you will have an outstanding knowledge of web visualization using HTML5, CSS3, and JavaScript to secure yourself a prominent place within the web development industry.
In this session, Aaron Gustafson introduces attendees to the client-side scripting language known as JavaScript. After being taken on a quick tour through the language's features and syntax, attendees will be introduced through a series of examples to ways in which JavaScript can progressively enhance the user experience and really make their designs sing. This session also introduces attendees to several JavaScript libraries and demonstrate how to execute the same task in each.
In this talk I introduced Functional Reactive Programming and ELM and finished off with a live demo building a complete game of snake in Elm.
Code for the demo can be found at : https://github.com/theburningmonk/elm-snake
Elm is still a narrow niche in Europe, instead more and more american companies are using it in production. After some learning time, Elm promises to eliminate runtime errors from your application, to make it more maintainable and easy to test. The goal of this talk is to show that having an ecosystem that guides programmers is better then being lost in the freedom of JS
Claudia Doppioslash - Time Travel for game development with ElmCodemotion
Elm is a purely Functional Reactive Programming language, which happens to have the best current implementation of a Time Travelling Debugger (see Bret Victor's Inventing on Principle [https://vimeo.com/36579366] from 12:25) and is ideally suited for games and UIs. We'll see how FRP, a strong yet simple(r than Haskell) type system and the interactive programming workflow make developing a small game much more pleasant compared to the mainstream game engines experience.
Elm: frontend code without runtime exceptionsPietro Grandi
As the market started asking for more complex web-applications, the limits of a dynamic, loosely typed language like Javascript forced the developers to look for solutions like Flow and Typescript. Elm is a functional language which compiles to Javascript. It is strongly typed, has an ML syntax, and a small, yet skilled and growing, community.
This Tutorial Cover HTML Forms input,select,textarea
Tutorial : http://sswebtricks.blogspot.in/2018/02/html-tutorial-topic-4.html
Video : https://www.youtube.com/watch?v=0mp7llEuZIA&t=461s
Source : https://github.com/hackstarsj/html-tutorial-topic-first
Web Visualization with HTML5, CSS3, and JavaScript is the course with the rapidly changing web development technologies, it has become important to stay in line with them to progress within the industry, which is why this course in web virtualization has been brought to you to spruce up your web designing and animating skills using HTML5, CSS3, and JavaScript. The latest features of HTML5, CSS3 and JavaScript are set to be provided to you through this course, hence, it is desired that you have basic knowledge on these programming languages for a smoother learning experience. This course will start off by walking you through the CSS3 virtualization techniques to design and animate webs. You will be taught how to create a 3D element using CSS transition and to transform animates into 2D and 3D, along with an insight into the elements of scalable vector graphics which is needed to create basic images and polygons and to animate. Our tutors will further take you through the canvas aspects of HTML5 to start drawing grids and animations using it. You will also get to learn how to create a callback and create and activate a queue that is needed in animating and the animation libraries that will be essential to your web designing projects. By the end of this course, you will have an outstanding knowledge of web visualization using HTML5, CSS3, and JavaScript to secure yourself a prominent place within the web development industry.
In this session, Aaron Gustafson introduces attendees to the client-side scripting language known as JavaScript. After being taken on a quick tour through the language's features and syntax, attendees will be introduced through a series of examples to ways in which JavaScript can progressively enhance the user experience and really make their designs sing. This session also introduces attendees to several JavaScript libraries and demonstrate how to execute the same task in each.
In this talk I introduced Functional Reactive Programming and ELM and finished off with a live demo building a complete game of snake in Elm.
Code for the demo can be found at : https://github.com/theburningmonk/elm-snake
Elm is still a narrow niche in Europe, instead more and more american companies are using it in production. After some learning time, Elm promises to eliminate runtime errors from your application, to make it more maintainable and easy to test. The goal of this talk is to show that having an ecosystem that guides programmers is better then being lost in the freedom of JS
Claudia Doppioslash - Time Travel for game development with ElmCodemotion
Elm is a purely Functional Reactive Programming language, which happens to have the best current implementation of a Time Travelling Debugger (see Bret Victor's Inventing on Principle [https://vimeo.com/36579366] from 12:25) and is ideally suited for games and UIs. We'll see how FRP, a strong yet simple(r than Haskell) type system and the interactive programming workflow make developing a small game much more pleasant compared to the mainstream game engines experience.
Elm: frontend code without runtime exceptionsPietro Grandi
As the market started asking for more complex web-applications, the limits of a dynamic, loosely typed language like Javascript forced the developers to look for solutions like Flow and Typescript. Elm is a functional language which compiles to Javascript. It is strongly typed, has an ML syntax, and a small, yet skilled and growing, community.
Functional programming languages promise to be easier to test and easier to debug. However, when learning the functional way we often try to translate our current techniques to another language. This is usually not easy and the end result is far from those promises we've heard. Early frustrations might even discourage from further learning.
In this talk I will show you two very simple patterns:
- Designing code around single data structure
- Dealing with impure parts of program like DBs, external services or IO
This should give beginners jump start for their first toy projects and further exploration.
For frontend devs, I am going to present a programming pattern that makes creating interactive browser based user interfaces much simpler than any existing JavaScript framework. I will show how Elm programming language can force us to follow the right path, which is great for working in teams.
For backend devs, I am going to show why it is not wise to use the same patterns (and languages) for backends and present how Elixir provides different set of abstractions which helps with scaling. I also briefly touch on Phoenix Framework principles which have couple similarities to the Elm way.
Are there enough web and UI frameworks for us developers? Absolutely! There are really cool web UI frameworks like GXT or Vaadin. There are swing and JavaFX for desktop apps and many others. Don’t forget all web frameworks! Which UI framework is the best for your next project and works with browsers and OS‘ in 5 or 10 years? Which investment is future save? The only solution is a technology and UI independent framework. Such a solution is JVx (Apache 2.0). It is a full-stack app framework, designed as library. Develop UI independent and decide which UI technology is best for you. If you prefer Swing, start your app as Swing Application. If it’s Vaadin, use Vaadin. Don’t rewrite your application, just choose the preferred UI technology!
Web Frontend development: tools and good practices to (re)organize the chaosMatteo Papadopoulos
After my first attempt to "organize the chaos" (2012) in the structure of a front-end project, Stefano Verna (@steffoz) and I, have tried to bring together a number of tools and conventions to deal with front-end development in a way that could be understandable and maintainable, over the time, by a whole team.
This presentation has been performed, for the first time, during the Ruby-Day-2014 in Venice, Italy.
Here the video of the speech (italian): https://www.youtube.com/watch?v=fUJOJY_yVXg&index=6&list=PL5ImBN21eKvbQ6kH6WCAqj1QqgusGsiO0
Agile IT: Modern Architecture for Rapid Mobile App DevelopmentAnyPresence
Chris Marsh, Principal Analyst at 451 Research and Rich Mendis, Chief Product and Marketing Officer at AnyPresence, share current trends and best practices to build a progressive mobile architecture and enable your business to compete in today’s mobile world.
The basics to start developing Rich Internet applications.
This presentation talks about some of the important stuff to follow to make the web application both interactive and robust
How can you bring true functional programming into the web world AND transpile down to JavaScript so you can run it anywhere? No, it's not a pipe dream - it's Elm. Elm describes itself as a direct competitor to React, but it’s so much more – it’s a language as well as a set of tools for building scalable web applications in a concise, maintainable way.
In this session, Spencer will explore the Elm programming language and how its functional roots will help you create web apps that scale. Attendees will learn about creating Elm components using the model-update-view pattern, how to use commands to perform HTTP requests, and how subscriptions can help create event-based reactive applications.
Modern Rapid Application Development - Too good to be trueWaveMaker, Inc.
Webinar: Modern Rapid Application Development - Too good to be true. The age-old problem chasing Enterprise IT custom application software development is the inability to deliver applications on time and at the speed at which business demands. Add to the mix the increasing demands on IT due to consumerization and mobility. Is the modern Rapid Application Development the answer to the problems that plague today’s Enterprise IT? Or is it too good to be true?
Slides from my talk about Elm 0.17 at the Dublin Elm Meetup.
Source: https://github.com/micktwomey/elm-0.17-dublin-elm-may-2016
Meetup page: http://www.meetup.com/Elm-User-Group-Dublin/events/230200405/
What is the DOM?
The DOM is a W3C (World Wide Web Consortium) standard.
The DOM defines a standard for accessing documents:
"The W3C Document Object Model (DOM) is a platform and language-neutral interface that allows programs and scripts to dynamically access and update the content, structure, and style of a document."
The W3C DOM standard is separated into 3 different parts:
Core DOM - standard model for all document types
XML DOM - standard model for XML documents
HTML DOM - standard model for HTML documents
The HTML DOM (Document Object Model)
When a web page is loaded, the browser creates a Document Object Model of the page.
The HTML DOM model is constructed as a tree of Objects.
With the HTML DOM, JavaScript can access and change all the elements of an HTML document.
An introduction to the web programming language Elm first made at Uppsala Tech Meetup on the 18th of April. Held by Johannes Ridderstedt. Thanks to Caspeco for hosting.
Python Code Camp (Professionals) is a whole day workshop that aims to enable professionals to learn Python Basics and Django.
Visit: http://devcon.ph/events/python-code-camp-professionals-2016
Learning HTML Five in simple and easy steps just a few click.
New Features:
HTML5 Syntax,
The DOCTYPE,
HTML5 Elements,
HTML5 Attributes,
HTML5 Document
A presentation made to our Elixir meetup group on what I've learned about Elm and what I value in it. Lots of links that can be explored during the presentation.
Code camp 2011 Getting Started with IOS, Una DalyUna Daly
Presentation at Code Camp on Oct 8, 2011, 1:15 pm in the Foothill College Cafeteria. Overview of iOS Platform and development with demonstration of building two applications that demonstrate the model-view-controller architecture and feature buttons, textfields, labels, and alerts.
Creating and Deploying Static Sites with HugoBrian Hogan
Most web sites don’t have data that changes, so why power them with a database and take the performance hit? In this talk we’ll explore static site generation using Hugo, an open-source static site generator. You’ll learn how to make a master layout for all pages, and how to use Markdown to create your content pages quickly.
Then we’ll explore how to deploy the site we made to production. We’ll automate the entire process. When you’re done, you’ll be able to build and deploy static web sites quickly with minimal tooling.
Automating the Cloud with Terraform, and AnsibleBrian Hogan
Need a web server? So did I. But setting everything up by hand is tedious. In this talk, you'll see how to build a load-balanced web server using Ansible, Terraform, and DigitalOcean, a cloud provider aimed at developers. First, you'll see how to build out the servers and load balancer, and then you'll see how to use Ansible Playbooks to install and upload the web site. When we're done, you'll have scripts you can run to set up your own environment.
Create Development and Production Environments with VagrantBrian Hogan
Need a Linux box to test a Wordpress site or a Windows VM to test a web site on IE 10? Creating a virtual machine to test or deploy your software doesn’t have to be a manual process. Bring one up in seconds with Vagrant, software for creating and managing virtual machines. With Vagrant, you can bring up a new virtual machine with the software you need, share directories, copy files, and configure networking using a friendly DSL. You can even use shell scripts or more powerful provisioning tools to set up your software and install your apps. Whether you need a Windows machine for testing an app, or a full-blown production environment for your apps, Vagrant has you covered.
In this talk you’ll learn to script the creation of multiple local virtual machines. Then you’ll use the same strategy to provision production servers in the cloud.
I work with Vagrant, Terraform, Docker, and other provisioning systems daily and am excited to show others how to bring this into their own workflows.
Docker is an amazing tool, but unless you work with it every day, you're probably left with a ton of questions. What's a container? What's an image? What's the difference between Docker, Machine, Compose, and Swarm? Why the heck should I care? Well, Docker makes it easier than ever to deploy and scale your applications and services. In addition, it lets you simulate your production environment on your local machine without heavy virtual machines. In this talk, we'll explore the basics of Docker, create a custom image for a web application, create a group of containers, and look at how you can put your apps into production on various cloud providers. At the end of the talk, you'll have the knowledge you need to put this to use with your own applications.
If you've ever looked into how to create Gems, you've probably seen a bunch of ways to do that. Project generators like Hoe, Jeweler, and the like offer some nice ways to get started, but they may often be overkill for many projects. If you're just starting out, why not learn to do it from scratch?
In this talk, we'll create our own gem from scratch, using only things that are provided by Ruby, its standard library, and RubyGems to craft a simple gem.
You'll learn how to set up a project, how to write and run tests, how to use Rake to quickly build the gem, and even how to create a gem that installs an executable command-line program.
Intro talks never let you learn about the things that make a language truly cool. In this talk we'll discover how advanced features of Ruby help us write cleaner more modular code.
Web Development With Ruby - From Simple To ComplexBrian Hogan
Beyond the massive hype of Ruby on Rails, there's an amazing world of frameworks, DSLs, and libraries that make the Ruby language a compelling choice when working on the web. In this talk, you'll get a chance to see how to use Ruby to quickly build a static web site, create complex stylesheets with ease, build a simple web service, crete a simple Websocket server, and test your existing applications. Finally, you'll see a few of the ways Rails really can make developing complex applications easier, from advanced database querying to rendering views in multiple formats.
Stop Reinventing The Wheel - The Ruby Standard LibraryBrian Hogan
My talk from Ruby Hoedown MMX. We talked about the Ruby standard library and how sometimes we reinvent things when we have perfectly good tools waiting for us to use them.
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.
Strategies for Successful Data Migration Tools.pptxvarshanayak241
Data migration is a complex but essential task for organizations aiming to modernize their IT infrastructure and leverage new technologies. By understanding common challenges and implementing these strategies, businesses can achieve a successful migration with minimal disruption. Data Migration Tool like Ask On Data play a pivotal role in this journey, offering features that streamline the process, ensure data integrity, and maintain security. With the right approach and tools, organizations can turn the challenge of data migration into an opportunity for growth and innovation.
How Does XfilesPro Ensure Security While Sharing Documents in Salesforce?XfilesPro
Worried about document security while sharing them in Salesforce? Fret no more! Here are the top-notch security standards XfilesPro upholds to ensure strong security for your Salesforce documents while sharing with internal or external people.
To learn more, read the blog: https://www.xfilespro.com/how-does-xfilespro-make-document-sharing-secure-and-seamless-in-salesforce/
SOCRadar Research Team: Latest Activities of IntelBrokerSOCRadar
The European Union Agency for Law Enforcement Cooperation (Europol) has suffered an alleged data breach after a notorious threat actor claimed to have exfiltrated data from its systems. Infamous data leaker IntelBroker posted on the even more infamous BreachForums hacking forum, saying that Europol suffered a data breach this month.
The alleged breach affected Europol agencies CCSE, EC3, Europol Platform for Experts, Law Enforcement Forum, and SIRIUS. Infiltration of these entities can disrupt ongoing investigations and compromise sensitive intelligence shared among international law enforcement agencies.
However, this is neither the first nor the last activity of IntekBroker. We have compiled for you what happened in the last few days. To track such hacker activities on dark web sources like hacker forums, private Telegram channels, and other hidden platforms where cyber threats often originate, you can check SOCRadar’s Dark Web News.
Stay Informed on Threat Actors’ Activity on the Dark Web with SOCRadar!
How Recreation Management Software Can Streamline Your Operations.pptxwottaspaceseo
Recreation management software streamlines operations by automating key tasks such as scheduling, registration, and payment processing, reducing manual workload and errors. It provides centralized management of facilities, classes, and events, ensuring efficient resource allocation and facility usage. The software offers user-friendly online portals for easy access to bookings and program information, enhancing customer experience. Real-time reporting and data analytics deliver insights into attendance and preferences, aiding in strategic decision-making. Additionally, effective communication tools keep participants and staff informed with timely updates. Overall, recreation management software enhances efficiency, improves service delivery, and boosts customer satisfaction.
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.
We describe the deployment and use of Globus Compute for remote computation. This content is aimed at researchers who wish to compute on remote resources using a unified programming interface, as well as system administrators who will deploy and operate Globus Compute services on their research computing infrastructure.
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.
Multiple Your Crypto Portfolio with the Innovative Features of Advanced Crypt...Hivelance Technology
Cryptocurrency trading bots are computer programs designed to automate buying, selling, and managing cryptocurrency transactions. These bots utilize advanced algorithms and machine learning techniques to analyze market data, identify trading opportunities, and execute trades on behalf of their users. By automating the decision-making process, crypto trading bots can react to market changes faster than human traders
Hivelance, a leading provider of cryptocurrency trading bot development services, stands out as the premier choice for crypto traders and developers. Hivelance boasts a team of seasoned cryptocurrency experts and software engineers who deeply understand the crypto market and the latest trends in automated trading, Hivelance leverages the latest technologies and tools in the industry, including advanced AI and machine learning algorithms, to create highly efficient and adaptable crypto trading bots
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.
Cyaniclab : Software Development Agency Portfolio.pdfCyanic lab
CyanicLab, an offshore custom software development company based in Sweden,India, Finland, is your go-to partner for startup development and innovative web design solutions. Our expert team specializes in crafting cutting-edge software tailored to meet the unique needs of startups and established enterprises alike. From conceptualization to execution, we offer comprehensive services including web and mobile app development, UI/UX design, and ongoing software maintenance. Ready to elevate your business? Contact CyanicLab today and let us propel your vision to success with our top-notch IT solutions.
How to Position Your Globus Data Portal for Success Ten Good PracticesGlobus
Science gateways allow science and engineering communities to access shared data, software, computing services, and instruments. Science gateways have gained a lot of traction in the last twenty years, as evidenced by projects such as the Science Gateways Community Institute (SGCI) and the Center of Excellence on Science Gateways (SGX3) in the US, The Australian Research Data Commons (ARDC) and its platforms in Australia, and the projects around Virtual Research Environments in Europe. A few mature frameworks have evolved with their different strengths and foci and have been taken up by a larger community such as the Globus Data Portal, Hubzero, Tapis, and Galaxy. However, even when gateways are built on successful frameworks, they continue to face the challenges of ongoing maintenance costs and how to meet the ever-expanding needs of the community they serve with enhanced features. It is not uncommon that gateways with compelling use cases are nonetheless unable to get past the prototype phase and become a full production service, or if they do, they don't survive more than a couple of years. While there is no guaranteed pathway to success, it seems likely that for any gateway there is a need for a strong community and/or solid funding streams to create and sustain its success. With over twenty years of examples to draw from, this presentation goes into detail for ten factors common to successful and enduring gateways that effectively serve as best practices for any new or developing gateway.
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.
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.
Experience our free, in-depth three-part Tendenci Platform Corporate Membership Management workshop series! In Session 1 on May 14th, 2024, we began with an Introduction and Setup, mastering the configuration of your Corporate Membership Module settings to establish membership types, applications, and more. Then, on May 16th, 2024, in Session 2, we focused on binding individual members to a Corporate Membership and Corporate Reps, teaching you how to add individual members and assign Corporate Representatives to manage dues, renewals, and associated members. Finally, on May 28th, 2024, in Session 3, we covered questions and concerns, addressing any queries or issues you may have.
For more Tendenci AMS events, check out www.tendenci.com/events
Globus Compute wth IRI Workflows - GlobusWorld 2024Globus
As part of the DOE Integrated Research Infrastructure (IRI) program, NERSC at Lawrence Berkeley National Lab and ALCF at Argonne National Lab are working closely with General Atomics on accelerating the computing requirements of the DIII-D experiment. As part of the work the team is investigating ways to speedup the time to solution for many different parts of the DIII-D workflow including how they run jobs on HPC systems. One of these routes is looking at Globus Compute as a way to replace the current method for managing tasks and we describe a brief proof of concept showing how Globus Compute could help to schedule jobs and be a tool to connect compute at different facilities.
OpenFOAM solver for Helmholtz equation, helmholtzFoam / helmholtzBubbleFoamtakuyayamamoto1800
In this slide, we show the simulation example and the way to compile this solver.
In this solver, the Helmholtz equation can be solved by helmholtzFoam. Also, the Helmholtz equation with uniformly dispersed bubbles can be simulated by helmholtzBubbleFoam.
Accelerate Enterprise Software Engineering with PlatformlessWSO2
Key takeaways:
Challenges of building platforms and the benefits of platformless.
Key principles of platformless, including API-first, cloud-native middleware, platform engineering, and developer experience.
How Choreo enables the platformless experience.
How key concepts like application architecture, domain-driven design, zero trust, and cell-based architecture are inherently a part of Choreo.
Demo of an end-to-end app built and deployed on Choreo.
Field Employee Tracking System| MiTrack App| Best Employee Tracking Solution|...informapgpstrackings
Keep tabs on your field staff effortlessly with Informap Technology Centre LLC. Real-time tracking, task assignment, and smart features for efficient management. Request a live demo today!
For more details, visit us : https://informapuae.com/field-staff-tracking/
2. About me
• I build web things.
• I teach people.
• I make music.
• I write books.
3. Elm is a functional programming language like Haskell, but more
friendly, and aimed at front-end web development.
We use Elm to make our user interface and give it behavior.
5. Elm compiles to JavaScript
Yes. We just wrote a bunch of code that gets injected into an HTML
page.
Feel gross yet?
6. That's what React does too.
var HelloMessage = React.createClass({
render: function () {
return <h1>Hello {this.props.message}!</h1>;
}
});
React.render(<HelloMessage message="World" />, document.body);
7. Okay, Why Elm?
• Same concepts as React
• Pure functions
• Immutable State
• Static Typing
8. What you need
• Node.js http://nodejs.org
• The elm package for Node
$ npm install -g elm
• Your favorite text editor
OR
http://elm-lang.org/try
9. Compiling Elm
• Create a hello.elm file
• Run
$ elm make hello.elm
Success! Compiled 1 modules.
Successfully generated index.html
• Open resulting index.html in your browser.
12. Elm Reactor
Elm Reactor compiles Elm to HTML on
each request.
$ elm-reactor
elm reactor 0.16.0
Listening on http://0.0.0.0:8000/
13. How Elm Works
Every Elm app calls a main function when we run it.
main =
-- something goes here
14. Functions
We define functions with a name followed by an = sign.
hello =
"Hello there"
We indent the definitions of functions.
We invoke this function like this:
hello
15. Arguments
Functions can have arguments
square number =
number * number
Call it as
square 2
They have explicit returns.
17. Type annotations
We can enforce data types for our functions so Elm can help us out.
functionName: TypeOfArg1-> TypeOfArg2 -> TypeOfArg3 -> ReturnType
18. Annotation Examples:
No parameters. Just return value
hello: String
hello =
"Hello there"
Two parameters and a return value
add: Float -> Float -> Float
add number1 number2 =
number1 + number2
20. Html functions
The elm-html module exposes many functions for building up virtual
DOM nodes.
The main function can render HTML if the HTML module is included.
import Html exposing(p, text)
main =
p [] [text "Hello World"]
21. p and text
p [] [text "Hello World"]
p and text are two functions from elm-html
p takes two lists
• a list of attributes (can be empty)
• a list of child elements
text takes a string of text to display.
22. HTML functions are uniform.
Each takes attributes and elements. So we can nest them like HTML.
div [class "foo", id "bar" ] [
h1 [] [text "Hello"],
p [] [text "World"]
]
There's a function for every element. Just be sure to expose what you
use.
23. Seriously uniform
label [for "name"] [text "Name"]
input [id "name", type' "number", step "any"] []
Even functions for tags that don't allow inner content still take two
lists as arguments.
24. Html Modules
• Html contains all the tags
• Html.Attributes contains the attributes (like class, id, href,
etc)
• Html.Events contains events like onClick
25. Html Attributes
import Html exposing(Html, div, text, p)
import Html.Attributes exposing(class)
main =
div [class "wrapper"] [
p [class "notice"] [text "This is important!"]
]
27. Resuability
main =
div [] [
view "Hello",
view "Goodbye"
]
view: String -> Html
view word =
div [] [
p [] [ text (word ++ " "), em [] [text "world"] ]
]
28. Web Interfaces
import Html exposing(Html, Attribute, p, text)
import Html.Attributes exposing(style)
elementStyle: Attribute
elementStyle =
style [ ("color", "red") , ("font-size", "2em") ]
main: Html
main =
view
view =
p [elementStyle] [text "Hello World"]
30. Build Out The Helpers
numberField: String -> String -> Html
numberField fieldID fieldName =
fieldWithLabel fieldID fieldName "number"
textField: String -> String -> Html
textField fieldID fieldName =
fieldWithLabel fieldID fieldName "text"
emailField: String -> String -> Html
emailField fieldID fieldName =
fieldWithLabel fieldID fieldName "email"
31. Shiny Happy Frontend Code
main: Html
main =
div [] [
textField "name" "Name",
numberField "age" "Age",
emailField "email" "Email"
]
32. Elm Architecture
View: Function that fires when model changes. Transofms a model
into the UI that people see.
Model: Something that holds the current state of the app. No behavior.
Just the state. No behavior. This is not MVC with objects!
Update: Function that fires when state changes. Always returns a new
model.
33. Signals and Mailboxes
Signals
Signals route messages around the application. Pressing a button is a
signal. We can send data along signals.
Mailboxes
Mailboxes receive signals and send signals. A mailbox has an address
and a signal to respond to.
34. Basic Flow
• Model is initialized
• View is displayed with model
• Events send Signals to Mailboxes
• Mailboxes trigger updates
• New model is created
• New view is rendered
Yikes!
35. Elm StartApp.Simple
Like Flux, without all the code.
• Define Actions
• Define a model to represent data
• Define a view function
• Define an update function that returns a new model.
36. Change Text On Click
import Html exposing (Html, text, h1, p, div, button)
import StartApp.Simple as StartApp
import Html.Events exposing (onClick)
main =
StartApp.start {model = "Hello ", view = view, update = update}
view address initialText =
div [] [
h1 [] [text "Events"],
p [] [ text initialText ],
button [onClick address "change"] [text "Push me"]
]
update action model =
"it changed"
37. Actions
Actions get sent to the Update.
type Action = Increment | Decrement
model = 0
update: Signal.Action -> Int -> Int
update action model =
case action of
Increment -> model + 1
Decrement -> model - 1
38. Multiple events
main =
StartApp.start { model = model, view = view, update = update }
view: Signal.Address Action -> Int -> Html
view address model =
div []
[ button [ onClick address Increment ] [ text "Up" ]
, span [] [ text (toString model) ]
, button [ onClick address Decrement ] [ text "Down" ]
]
39. Once again...
• StartApp renders the view using an initial model state.
• Events defined in the view send Actions to Signal Addresses
which route to update.
• update returns a new version of the model
• StartApp causes the view to be rendered whenever model
changes.
40. Calculator
Compound Interest Calculator
Write a program to compute the value of an investment compounded
over time. The program should ask for the starting amount, the
number of years to invest, the interest rate, and the number of periods
per year to compound.
41. Project setup
Create folder and file to work in
$ mkdir calculator && cd calculator
$ touch calculator.elm
Init the project
$ elm package install
Install HTML and StartApp dependencies.
$ elm package install evancz/elm-html
$ elm package install evancz/start-app
52. Define A Model
type alias Model =
{ principle: String
, rate: String
, years: String
, periods: String
, newAmount: Float}
model: Model
model =
{ principle = "1500.00"
, rate = "4.3"
, years = "6"
, periods = "4"
, newAmount = 0 }
53. Pass address, action, and model data to fields
view: Signal.Address Action -> Model -> Html
view address model =
div [] [
h1 [] [text "Calculator"],
div [] [
numberField address SetPrinciple "principle" "Principle" model.principle,
numberField address SetRate "rate" "Rate" model.rate,
numberField address SetPeriods "periods" "Periods" model.periods,
numberField address SetYears "years" "Years" model.years
],
button [onClick address Calculate] [text "Click me"],
54. Add Events To Form using Actions and model data
numberField: Signal.Address Action -> (String -> Action) ->
String -> String -> String -> Html
numberField address action fieldID name fieldValue =
div [] [
label [labelStyle, for fieldID] [text name],
input [id fieldID, type' "number", step "any",
on "input" targetValue (Signal.message address << action ),
value fieldValue] []
]
55. Update model from form
update: Action -> Model -> Model
update action model =
case action of
NoOp -> model
SetPrinciple p -> {model | principle = p}
SetRate r -> {model | rate = r}
SetYears y -> {model | years = y}
SetPeriods p -> {model | periods = p}
Calculate -> calculateNewAmount model
56. The program Logic
compoundInterest: Float -> Float -> Float -> Float -> Float
compoundInterest principle rate periods years =
(principle * (1 + (rate / periods ) ) ^ (years * periods) )
57. Converting Strings To Floats
convertToFloat: String -> Float
convertToFloat string =
case String.toFloat string of
Ok n -> n
Err _ -> 0.0
58. Implement CalculateNewAmount
calculateNewAmount: Model -> Model
calculateNewAmount model =
let
rate = convertToFloat model.rate / 100
years = convertToFloat model.years
principle = convertToFloat model.principle
periods = convertToFloat model.periods
in
{model | newAmount = (compoundInterest principle rate periods years) }
59. Display the Output
output: Model -> Html
output model =
div [] [
span [] [text "Amount: "],
span [] [text (toString model.newAmount) ]
]
And add it to the view.
60. Discuss
What are your thoughts?
Is this cool? Good? Bad? A terrible idea or
the greatest thing ever?
61. Issues
1. Tons of code to do simple things
2. Integration with external services is
complex
3. Must re-learn a lot of things about web
development
4. Small community
62. Benefits
1. Small community
2. Benefits of React with a clear
opinionated approach
3. Fantastic error messages
4. Types ensure data integrity and flow
63. Write code
• Elm website: http://elm-lang.org/
• Try Elm http://elm-lang.org/try
• Package system: http://package.elm-
lang.org/
• Documentation http://elm-lang.org/docs