Functions in JavaScript

What is it?

Functions are code blocks designed to perform a task. It is defined, and then executed when the code calls it.

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Function syntax

The main way to define functions is using the function keyword, followed by the function’s name, and its arguments.

function myFunction (myArg) {
	// Code goes here
	return myArg;
}

Anonymous functions

A function can be also be anonymous if no name is passed.

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Arrow function

Arrow functions allows shorter function syntax. If needed, you can omit the brackets, { }. The interpreter hands the return statement behind the scenes. You can rewrite the above function using arrow syntax:

let myFunction = myArg => MyArg;
 
let myFunction = (Arg1, Arg2) => {
	// Do something with the arguments
	return Arg1, Arg2;
}