Rest and Spread Operators in JavaScript

 Rest and Spread Operators in JavaScript

The rest and spread operators are new features in ES6 that provide a way to work with arrays and objects more easily.

Here's an example of how to use the rest operator to create a function that accepts any number of arguments:

javascript

Copy code

function sum(...numbers) {

  return numbers.reduce(function(a, b) {

    return a + b;

  });

}

console.log(sum(1, 2, 3, 4, 5)); // prints 15

The ...numbers syntax is the rest operator, which gathers all remaining arguments into an array.

Here's an example of how to use the spread operator to concatenate two arrays:

css

var numbers1 = [1, 2, 3];

var numbers2 = [4, 5, 6];

var combined = [...numbers1, ...numbers2];

console.log(combined); // prints [1, 2, 3, 4, 5, 6]

The ...numbers1 and ...numbers2 syntax is the spread operator, which spreads the contents of the arrays into a new array.