What does export default do in JSX

Question

I want to ask what the last sentence means and does  export default HelloWorld   but I can t find any tutorials about it      hello-world jsx  import React from  react    class HelloWorld extends React Component     render         return  lt p gt Hello  world  lt  p gt          export default HelloWorld

User · Answer

In simple word export means letting the script we wrote to be used by another script  If we say export  we mean any module can use this script by importing it

User · Answer

Export like export default HelloWorld  and import  such as import React from  react  are part of the ES6 modules system   A module is a self contained unit that can expose assets to other modules using export  and acquire assets from other modules using import    In your code   import React from  react      get the React object from the react module  class HelloWorld extends React Component     render         return  lt p gt Hello  world  lt  p gt          export default HelloWorld     expose the HelloWorld component to other modules   In ES6 there are two kinds of exports   Named exports - for example export function func      is a named export with the name of func  Named modules can be imported using import   exportName   from  module    In this case  the name of the import should be the same as the name of the export  To import the func in the example  you ll have to use import   func   from  module    There can be multiple named exports in one module   Default export - is the value that will be imported from the module  if you use the simple import statement import X from  module   X is the name that will be given locally to the variable assigned to contain the value  and it doesn t have to be named like the origin export  There can be only one default export   A module can contain both named exports and a default export  and they can be imported together using import defaultExport    namedExport1  namedExport3  etc      from  module

User · Answer

Simplest Understanding for default export is Export is ES6 s feature which is used to Export a module file  and use it in some other module file   Default Export   default export is the convention if you want to export only one object variable  function  class  from the file module   There could be only one default export per file  but not restricted to only one export  When importing default exported object we can rename it as well   Export or Named Export   It is used to export the object variable  function  calss  with the same name   It is used to export multiple objects from one file   It cannot be renamed when importing in another file  it must have the same name that was used to export it  but we can create its alias by using as operator    In React  Vue and many other frameworks the Export is mostly used to export reusable components to make modular based applications

User · Answer

export default is used to export a single class  function or primitive from a script file   The export can also be written as  export default class HelloWorld extends React Component     render         return  lt p gt Hello  world  lt  p gt           You could also write this as a function component like   export default const HelloWorld        gt    lt p gt Hello  world  lt  p gt      This is used to import this function in another script file  import HelloWorld from    HelloWorld     You don t necessarily import it as HelloWorld you can give it any name as it s a default export  A little about export  As the name says  it s used to export functions  objects  classes or expressions from script files or modules  Utiliites js  export function cube x      return x   x   x    export const foo   Math PI   Math SQRT2    This can be imported and used as  App js  import   cube  foo   from  Utilities   console log cube 3       27 console log foo         4 555806215962888   Or  import   as utilities from  Utilities   console log utilities cube 3       27 console log utilities foo         4 555806215962888   When export default is used  this is much simpler  Script files just exports one thing  cube js  export default function cube x      return x   x   x       and used as App js  import Cube from  cube   console log Cube 3       27

User · Answer

In Simple Words -     The export statement is used when creating JavaScript modules to   export functions  objects  or primitive values from the module so   they can be used by other programs with the import statement    Here is a link to get clear understanding   MDN Web Docs

User · Answer

Before learning about Export Default lets understand what is Export and Import is  In the general term  exports are the goods and services that can be sent to others  similarly  export in function components means you are letting your function or component to use by another script  Export default means you want to export only one value the is present by default in your script so that others script can import that for use  This is very much necessary for code Reusability   Let s see the code of how we can use this   import react from  react   function Header         return  lt p gt  lt b gt  lt h1 gt This is the Heading section lt  h1 gt  lt  b gt  lt  p gt       export default Header      Because of this export it can be imported like this-  import Header from    Header     if any one comment the export section you will get the following error     You will get error like this -

[javascript] What does "export default" do in JSX?

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