JavaScript snippets for React

react

propTypeBoolRequired

propTypeBool

propTypeArrayRequired

propTypeArray



The code creates a list the length of first and sets the first element of the list to second. The second element of the list is set to the result of using the function useState on the second element of the input list.

useState



In this code, first is a variable that refers to the value of second .

useRef



The code defines an immutable state and a function to dispatch an action to one or more reducers.

useReducer



The useLayoutEffect function takes an anonymous function as its first argument. That function will be executed once per item in the array first. The second argument is an array of anonymous functions, each of which will be executed once per item in the array third.

useLayoutEffect



This code creates a memo which will call the function first() every time it is invoked. The second argument is an optional function which will be called after first() has completed.

useMemo



This code takes an arbitrary number of values and uses an imperative handle to call a function with those values as arguments.

useImperativeHandle



This code uses the useContext function to create a new context. The second context is then used in the first context.

useContext


The code fragment uses an effect to run a function twice with two different values. The first time, the function returns nothing, and the second time, it returns the value of third.

useEffect


The code will call the function first with the arguments second, then call the function second with the same arguments.

useCallback



This prints "console.info" on the console.

consoleInfo



This will create an empty table in the console.

consoleTable



console.timeEnd('second')

console.timeEnd('third')

console.timeEnd()

The console.timeEnd() function will return the number of milliseconds since the system was started.

consoleTimeEnd



This code prints the phrase "console.warn(first)" to the console. The console is a text-based user interface that allows you to view and interact with the code that is running in your computer.

consoleWarn



This will print the time in milliseconds since the system was started.

consoleTime



This code will log the string "first" on the console.

consoleLogObject



The following code would print "first {" to the console.

consoleLogJson

consoleLog



This simply prints the string first to the console.

consoleTrace



The console.group() function groups the items in the console window by name.

consoleGroup



The console.groupEnd() function is used to end the execution of a console group. This function is typically used when you want to exit the console context and return to the main program.

consoleGroupEnd



The statement console.error(first) prints an error message and exits the program.

consoleError



This line prints the number of inhabitants of the console.

consoleCount



The console.dir() function returns a string that contains a list of all the files in the current directory.

consoleDir



The assert() method is a console.log() convenience method that enables you to test a condition without running the code that defines the condition. In this case, the condition is that first and second are equal.

consoleAssert

consoleClear


In this code, the code exports a function that takes one parameter, props, which is a object containing the properties of the component. The return of the function is a div element that contains the string "first".

reactFunctionalComponentWithPropTypes

reactFunctionalExportComponent

reactFunctionalComponentReduxPropTypes


In the above code, the ${1:filename} function takes one parameter, which is the name of the file to be rendered. The function returns a div element with the text "first".

reactFunctionalComponent

reactFunctionalComponentRedux



In the code above, the import PropTypes from 'prop-types' is importing the PropTypes module. Next, in the MMAction component, the import React, { memo } from 'react' is importing React and the memo function. The ${1:filename} variable is referencing the memo function, which will be invoked with three arguments. The first argument will be the props object, and the second and third arguments will be the same as the props object. The memo function will return a <div> element with the first element in it.

reactFunctionMemoComponentWithPropTypes



The import statement returns an anonymous function that takes no arguments. The memo() function takes a single argument, which is a function that is called with no arguments. The return statement creates an element that contains the string "first" and ignores any other arguments passed to memo().

reactFunctionMemoComponent


When you use PropTypes in your code, the compiler will ensure that your code is valid and type-safe. In this example, the PropTypes module defines a list of property types that this generic class can expect. This means that React can validate that the class property defined in render() matches the expected types.

reactClassPureComponentWithPropTypes


The following code is creating a React PureComponent. A PureComponent is a class which does not contain any state or react components. When a PureComponent is created, it is initialized with a specific filename. The code next renders a simple div element.

reactClassPureComponent



In this code, React is importing PureComponent from React. PureComponent is a react component library that helps you to create pure, unmounted, stateless components. The exports in this code exports a class named ${1:filename} which extends PureComponent. The constructor for this class takes one parameter, which is the filename of the component. This class renders a div with the text first.

reactClassExportPureComponent

reactClassExportComponent

reactClassExportComponentWithPropTypes



In the code above, React is importing Component from react and react-redux. Next, it is exporting a class named ${1:filename}. ${1:filename} will be our component. Next, it is extending Component from react and creating a method named render(). Render() will be the method that will be invoked when the component is rendered.

Next, React is importing two functions from react-redux. First, mapStateToProps will be importing from react-redux and will be taking in state as an argument. Next, mapDispatchToProps will be importing from react-redux and will be taking in dispatch as an argument. Finally, ${1:filename} is exporting a function named connect(). Connect() will be taking in mapStateToProps and mapDispatchToProps and will be returning a new function named ${1:filename} which will be able to handle state and dispatch.

reactClassComponentRedux

reactClassComponentReduxPropTypes


The code imports PropTypes from 'prop-types' and React from 'react' . It then exports a class called ${1:filename} which extends Component . The class defines a static propTypes variable which holds an object with two properties: second and third . The class also defines a render function which returns a <div> element.

reactClassComponentPropTypes


This code imports React and Component from react and declares a class named ${1:filename} that extends Component. This class has a render() function that returns a <div> element with the value first.

reactClassComponent



In this code, the import React line is referring to the React library. The ${1:filename} variable is defined as () => {}, which is a function that takes one argument, a string. The function returns a <div> element.

reactArrowFunctionExportComponent



In this code, the code import React from 'react' and import PropTypes from 'prop-types' declares that the code will use React and PropTypes to create a code structure.

Next, the code defines a variable called ${1:filename} which will store the filename as a string. Next, the code defines a function called props which takes an object as its only argument. The props function will return a div element which will display the first filename.

Next, the code defines a variable called ${1:filename} which will store the filename as a string. Next, the code defines a function called props which takes an object as its only argument.

reactArrowFunctionComponentWithPropTypes


This code imports React and exports a function that returns a <div> element with the text "first".

reactArrowFunctionComponent



The code imports View and Text from React Native. It also declares a variable, ${1:filename} . The ${1:filename} variable will be used to bind a function to an object. The function will be used to render a View component. The View component will have a Text component as its child. The ${1:filename} variable will be used in the function to refer to the child Text component.

typescriptReactNativeArrowFunctionComponent



PureComponent is a class that inherits from React.Component . It renders a single child component. In this code, we create a class called Props and set it as the props object for the ${1:filename} class. The ${1:filename} class extends PureComponent and overrides the render method. In this method, we return a div element with the text first .

Name	Language	Author	Uses
propTypeBoolRequired	JavaScript	l lucycodes42	0
propTypeBool	JavaScript	l lucycodes42	0
propTypeArrayRequired	JavaScript	l lucycodes42	0
propTypeArray	JavaScript	l lucycodes42	0
useState	JavaScript	l lucycodes42	7
useRef	JavaScript	l lucycodes42	4
useReducer	JavaScript	l lucycodes42	1
useLayoutEffect	JavaScript	l lucycodes42	0
useMemo	JavaScript	l lucycodes42	1
useImperativeHandle	JavaScript	l lucycodes42	1
useContext	JavaScript	l lucycodes42	4
useEffect	JavaScript	l lucycodes42	7
useCallback	JavaScript	l lucycodes42	3
consoleInfo	JavaScript	l lucycodes42	1
consoleTable	JavaScript	l lucycodes42	2
consoleTimeEnd	JavaScript	l lucycodes42	1
consoleWarn	JavaScript	l lucycodes42	0
consoleTime	JavaScript	l lucycodes42	1
consoleLogObject	JavaScript	l lucycodes42	3
consoleLogJson	JavaScript	l lucycodes42	1
consoleLog	JavaScript	l lucycodes42	37
consoleTrace	JavaScript	l lucycodes42	6
consoleGroup	JavaScript	l lucycodes42	1
consoleGroupEnd	JavaScript	l lucycodes42	1
consoleError	JavaScript	l lucycodes42	1
consoleCount	JavaScript	l lucycodes42	0
consoleDir	JavaScript	l lucycodes42	2
consoleAssert	JavaScript	l lucycodes42	11
consoleClear	JavaScript	l lucycodes42	2
reactFunctionalComponentWithPropTypes	JavaScript	l lucycodes42	2
reactFunctionalExportComponent	JavaScript	l lucycodes42	8
reactFunctionalComponentReduxPropTypes	JavaScript	l lucycodes42	0
reactFunctionalComponent	JavaScript	l lucycodes42	5
reactFunctionalComponentRedux	JavaScript	l lucycodes42	0
reactFunctionMemoComponentWithPropTypes	JavaScript	l lucycodes42	0
reactFunctionMemoComponent	JavaScript	l lucycodes42	0
reactClassPureComponentWithPropTypes	JavaScript	l lucycodes42	1
reactClassPureComponent	JavaScript	l lucycodes42	0
reactClassExportPureComponent	JavaScript	l lucycodes42	1
reactClassExportComponent	JavaScript	l lucycodes42	1
reactClassExportComponentWithPropTypes	JavaScript	l lucycodes42	1
reactClassComponentRedux	JavaScript	l lucycodes42	3
reactClassComponentReduxPropTypes	JavaScript	l lucycodes42	0
reactClassComponentPropTypes	JavaScript	l lucycodes42	2
reactClassComponent	JavaScript	l lucycodes42	2
reactArrowFunctionExportComponent	JavaScript	l lucycodes42	35
reactArrowFunctionComponentWithPropTypes	JavaScript	l lucycodes42	11
reactArrowFunctionComponent	JavaScript	l lucycodes42	34
typescriptReactNativeArrowFunctionComponent	TypeScript	l lucycodes42	3
typescriptReactClassExportPureComponent	TypeScript	l lucycodes42	1

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