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*markdown* here!'};
REACTDOM - REACT
Render a React element into the DOM in the supplied container and return a reference to the component (or returns null for stateless components).. If the React element was previously rendered into container, this will perform an update on it and only mutate the DOM as necessary to reflect the latest React element.. If the optional callback is provided, it will be executed after the component FORMS - REACT - GITHUB PAGES Try it on CodePen. Since the value attribute is set on our form element, the displayed value will always be this.state.value, making the React state the source of truth.Since handleChange runs on every keystroke to update the React state, the displayed value will update as the user types.. With a controlled component, every state mutation will have an associated handler function.PERFORMANCE TOOLS
Overview #. React is usually quite fast out of the box. However, in situations where you need to squeeze every ounce of performance out of your app, it provides a shouldComponentUpdate() hook where you can add optimization hints to React's diff algorithm.. In addition to giving you an overview of your app's overall performance, Perf is a profiling tool that tells you exactly where you need toLISTS AND KEYS
Try it on CodePen. This code displays a bullet list of numbers between 1 and 5. Basic List Component #. Usually you would render lists inside a component.. We can refactor the previous example into a component that accepts an array of numbers and outputs an unordered list ofelements.
SYNTHETICEVENT
Note: As of v0.14, returning false from an event handler will no longer stop event propagation. Instead, e.stopPropagation() or e.preventDefault() should be triggered manually, as appropriate. Event Pooling #. The SyntheticEvent is pooled. This means that the SyntheticEvent object will be reused and all properties will be nullified after the event callback has been invoked. OPTIMIZING PERFORMANCE In this code, shouldComponentUpdate is just checking if there is any change in props.color or state.count.If those values don't change, the component doesn't update. If your component got more complex, you could use a similar pattern of doing a "shallow comparison" between all the fields of props and state to determine if the component should update. . This pattern is common enough that ReactTEST UTILITIES
Render a React element into a detached DOM node in the document. This function requires a DOM. Note: You will need to have window, window.document and window.document.createElement globally available before you import React.Otherwise React will think it can't access theREACTDOMSERVER
ReactDOMServer.renderToString(element) Render a React element to its initial HTML. This should only be used on the server. React will return an HTML string. You can use this method to generate HTML on the server and send the markup down on the initial request for faster page loads and to allow search engines to crawl your pages for SEOpurposes.
PONG - GITHUB PAGES
Pong. Keep going Try again. Flappy bird HTML created by uralozden using Phaser , itself a fork of marksteve 's Heavy Bird. 2048 Created by Gabriele Cirulli. Based on 1024 by Veewo Studio and conceptually similar to Threes by Asher Vollmer. A JAVASCRIPT LIBRARY FOR BUILDING USER INTERFACES A Component Using External Plugins. React is flexible and provides hooks that allow you to interface with other libraries and frameworks. This example uses remarkable, an external Markdown library, to convert the textarea's value in real time. this.state = {value: 'Type some*markdown* here!'};
REACTDOM - REACT
Render a React element into the DOM in the supplied container and return a reference to the component (or returns null for stateless components).. If the React element was previously rendered into container, this will perform an update on it and only mutate the DOM as necessary to reflect the latest React element.. If the optional callback is provided, it will be executed after the component FORMS - REACT - GITHUB PAGES Try it on CodePen. Since the value attribute is set on our form element, the displayed value will always be this.state.value, making the React state the source of truth.Since handleChange runs on every keystroke to update the React state, the displayed value will update as the user types.. With a controlled component, every state mutation will have an associated handler function.PERFORMANCE TOOLS
Overview #. React is usually quite fast out of the box. However, in situations where you need to squeeze every ounce of performance out of your app, it provides a shouldComponentUpdate() hook where you can add optimization hints to React's diff algorithm.. In addition to giving you an overview of your app's overall performance, Perf is a profiling tool that tells you exactly where you need toLISTS AND KEYS
Try it on CodePen. This code displays a bullet list of numbers between 1 and 5. Basic List Component #. Usually you would render lists inside a component.. We can refactor the previous example into a component that accepts an array of numbers and outputs an unordered list ofelements.
SYNTHETICEVENT
Note: As of v0.14, returning false from an event handler will no longer stop event propagation. Instead, e.stopPropagation() or e.preventDefault() should be triggered manually, as appropriate. Event Pooling #. The SyntheticEvent is pooled. This means that the SyntheticEvent object will be reused and all properties will be nullified after the event callback has been invoked. OPTIMIZING PERFORMANCE In this code, shouldComponentUpdate is just checking if there is any change in props.color or state.count.If those values don't change, the component doesn't update. If your component got more complex, you could use a similar pattern of doing a "shallow comparison" between all the fields of props and state to determine if the component should update. . This pattern is common enough that ReactTEST UTILITIES
Render a React element into a detached DOM node in the document. This function requires a DOM. Note: You will need to have window, window.document and window.document.createElement globally available before you import React.Otherwise React will think it can't access theREACTDOMSERVER
ReactDOMServer.renderToString(element) Render a React element to its initial HTML. This should only be used on the server. React will return an HTML string. You can use this method to generate HTML on the server and send the markup down on the initial request for faster page loads and to allow search engines to crawl your pages for SEOpurposes.
PONG - GITHUB PAGES
Pong. Keep going Try again. Flappy bird HTML created by uralozden using Phaser , itself a fork of marksteve 's Heavy Bird. 2048 Created by Gabriele Cirulli. Based on 1024 by Veewo Studio and conceptually similar to Threes by Asher Vollmer. A JAVASCRIPT LIBRARY FOR BUILDING USER INTERFACES A Stateful Component. In addition to taking input data (accessed via this.props), a component can maintain internal state data (accessed via this.state).When a component's state data changes, the rendered markup will be updated by re-invoking render(). TUTORIAL: INTRO TO REACT The render method returns a description of what you want to render, and then React takes that description and renders it to the screen. In particular, render returns a React element, which is a lightweight description of what to render. Most React developers use a special syntax called JSX which makes it easier to write these structures.LISTS AND KEYS
Try it on CodePen. This code displays a bullet list of numbers between 1 and 5. Basic List Component #. Usually you would render lists inside a component.. We can refactor the previous example into a component that accepts an array of numbers and outputs an unordered list ofelements.
PERFORMANCE TOOLS
Overview #. React is usually quite fast out of the box. However, in situations where you need to squeeze every ounce of performance out of your app, it provides a shouldComponentUpdate() hook where you can add optimization hints to React's diff algorithm.. In addition to giving you an overview of your app's overall performance, Perf is a profiling tool that tells you exactly where you need to FORMS - REACT - GITHUB PAGES Try it on CodePen. Since the value attribute is set on our form element, the displayed value will always be this.state.value, making the React state the source of truth.Since handleChange runs on every keystroke to update the React state, the displayed value will update as the user types.. With a controlled component, every state mutation will have an associated handler function.REACT.COMPONENT
componentWillReceiveProps() is invoked before a mounted component receives new props. If you need to update the state in response to prop changes (for example, to reset it), you may compare this.props and nextProps and perform state transitions using this.setState() in this method.. Note that React may call this method even if the props have not changed, so make sure to compare the current andHANDLING EVENTS
Here, e is a synthetic event. React defines these synthetic events according to the W3C spec, so you don't need to worry about cross-browser compatibility.See the SyntheticEvent reference guide to learn more.. When using React you should generally not need to call addEventListener to add listeners to a DOM element after it is created. Instead, just provide a listener when the element isINTRODUCING JSX
It is called JSX, and it is a syntax extension to JavaScript. We recommend using it with React to describe what the UI should look like. JSX may remind you of a template language, but it comes with the full power of JavaScript. JSX produces React "elements". We willLIFTING STATE UP
Lifting State Up#. First, we will write two functions to convert from Celsius to Fahrenheit and back: function toCelsius(fahrenheit) { return (fahrenheit - 32) * 5 / 9; } function toFahrenheit(celsius) { return (celsius * 9 / 5) + 32; } These two functions convert numbers. We will write another function that takes a string value and aconverter
PONG - GITHUB PAGES
Pong. Keep going Try again. Flappy bird HTML created by uralozden using Phaser , itself a fork of marksteve 's Heavy Bird. 2048 Created by Gabriele Cirulli. Based on 1024 by Veewo Studio and conceptually similar to Threes by Asher Vollmer.* Docs
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Hello! This particular page hash has moved to . Please update the URLs to reflect it. Thanks! ReasonConf US 2019 is happening in Chicago on October 8th. Get your tickets soon! type schoolPerson =| Teacher
| Director
| Student(string);
let greeting = person =>switch (person) {
| Teacher => "Hey Professor!" | Director => "Hello Director." | Student("Richard") => "Still here Ricky?" | Student(anyOtherName) => "Hey, " ++ anyOtherName ++ "."};
type schoolPerson = Teacher | Director | Student(string); let greeting = person =>switch (person) {
| Teacher => "Hey Professor!" | Director => "Hello Director." | Student("Richard") => "Still here Ricky?" | Student(anyOtherName) => "Hey, " ++ anyOtherName ++ "."};
Reason lets you write simple, fast and quality type safe code while leveraging both the JavaScript & OCaml ecosystems.Try Online
Quick Start
Types without hassle Powerful, safe type inference means you rarely have to annotate types, but everything gets checked for you. Easy JavaScript interop Use packages from NPM/Yarn with minimum hassle, or even drop in a snippet of raw JavaScript while you're learning!Flexible & Fun
Make websites, animations, games, servers, cli tools, and more! Take a look at these examples to get inspired.QUICKSTART
npm install -g bs-platform bsb -init my-first-app -theme basic-reasoncd my-first-app
npm run start
It runs in watch mode, so any changes to files will be picked up and compiled. Read more here!EXAMPLES
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