developer-roadmap/src/data/question-groups/javascript/content/merge-arrays.md

Yes, you can merge multiple arrays into one array using the concat() method, or the spread operator ....

concat()

The concat() method is used to merge two or more arrays. This method does not change the existing arrays, but instead returns a new array.

const arr1 = [1, 2, 3];
const arr2 = [4, 5, 6];

const arr3 = arr1.concat(arr2);
console.log(arr3); // [1, 2, 3, 4, 5, 6]

Spread operator

The spread operator ... is used to expand an iterable object into the list of arguments.

const arr1 = [1, 2, 3];
const arr2 = [4, 5, 6];

const arr3 = [...arr1, ...arr2];
console.log(arr3); // [1, 2, 3, 4, 5, 6]