Concatenating Array Items into a Single Array

In JavaScript, combining the elements of multiple arrays into a new array can be a common need. One way to achieve this is by using a loop to iterate through each source array and push the items into the target array. However, this approach can be tedious and inefficient.

Leveraging the 'concat' Function

Fortunately, JavaScript provides a more straightforward and elegant solution: the 'concat' function. This function effectively appends the elements of the target arrays into a new array, leaving the original arrays unchanged.

Usage:

To utilize 'concat,' simply pass the source arrays as arguments within parentheses:

var arrayA = [1, 2];
var arrayB = [3, 4];
var newArray = arrayA.concat(arrayB);

Output:

[1, 2, 3, 4]

This concise approach allows for the efficient concatenation of multiple arrays, eliminating the need for iteration and manual item addition.