What is export default in JavaScript?

In JavaScript, export default is a syntax used to export a single value from a module, making it the default export of that module. This syntax is particularly useful when a module is designed to output one main functionality, object, or value, although it can also contain other named exports.

Understanding export default

The export default statement is used to define the default export of a JavaScript module. This default export can be a function, class, object, or any other JavaScript expression. When you use export default, you do not need to use curly braces during the import of that module in another file, and you can assign any name to it when importing.

Key Characteristics

1. Singular Default Export: Each module can have only one default export. This makes it straightforward to import the primary functionality of the module without remembering the exact name of the exported entity[1][4][5].

2. Flexibility in Naming: When importing a default export, you can use any name you like. This is different from named exports, which require you to use the exact name specified in the export statement[1][4][5].

3. Syntax Simplicity: The syntax for using export default is straightforward. For example, if you have a function that you wish to export as the default, you can write:

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   export default function() { console.log("This is the default export"); }

   And when importing, you can use:

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   import myFunction from './module';

Examples and Usage

• Exporting a Function: You can export a function as the default export directly using export default function myFunction() {}. When importing, you can refer to it with any name like import func from './myModule'[1][2][4]...