What Is Export Default In Javascript

Let's dive into the world of JavaScript and explore what export default really means. If you're a software developer, especially in the realm of front-end web development, you've likely come across the term "export default" when working with JavaScript modules. But what does it actually do and how can you use it to enhance your coding skills? Let's find out!

In JavaScript, the "export default" statement is commonly used to export a single value, function, or object from a module. When you define something as "export default," it means that it will be the default export from that module. This can be particularly useful when you want to have a main, or default, export that represents the module as a whole.

So, how do you use export default in your JavaScript code? First, you need to define the value, function, or object that you want to export as the default. For example, if you have a function named "myFunction" that you want to export as the default from your module, you would do so like this:

function myFunction() {
  // Function logic here
}

export default myFunction;

In this code snippet, we've defined the function "myFunction" and then immediately exported it as the default export from the module using the "export default" statement. Now, when another module imports this module, they can simply refer to "myFunction" as the default export without needing to specify its name.

When importing a default export from a module, you can use the "import" statement followed by any name you want to assign to the default export. Here's an example of how you would import the default export "myFunction" from the module where we defined it earlier:

import myDefaultFunction from './myModule.js';

myDefaultFunction();

In this import statement, we're importing the default export from the module named "myModule.js" and assigning it the name "myDefaultFunction." By doing so, we can now call "myDefaultFunction" in our code to execute the logic inside the function.

It's worth noting that you can only have one default export per module. This means that if you try to export multiple values as defaults in the same file, you'll likely encounter an error.

In conclusion, the "export default" statement in JavaScript is a powerful tool for organizing and structuring your code when working with modules. By designating a default export, you can streamline the way other modules interact with yours and create a clear entry point for your module's functionality.

So, next time you're writing JavaScript code and need to export a single value, function, or object as the default from your module, remember to reach for the trusty "export default" statement to make your code cleaner and more maintainable. Happy coding!