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=> in JavaScript

By: Tanya in Javascript Tutorials on 2023年04月26日 [フレーム]

In JavaScript, => is called an arrow function or a fat arrow function. It's a shorthand syntax for defining functions that was introduced in ECMAScript 6 (ES6).

Arrow functions are similar to traditional JavaScript functions in many ways, but with a few differences. One key difference is that arrow functions don't have their own this keyword, and instead use the this value of their surrounding lexical context (i.e., the value of this in the enclosing function or global scope). This can make it easier to write concise, readable code, especially when dealing with complex callback functions.

Here's an example of an arrow function that doubles a given number:

const double = (num) => num * 2;

And here's the equivalent traditional function:

function double(num) {
 return num * 2;
}

As you can see, the arrow function syntax is more concise and reads like a mathematical function.




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