How do you combine multiple arrays into a single new array in JavaScript?

Combining Array Items into a New Array

In JavaScript, you may encounter situations where you need to consolidate the elements of multiple arrays into a single new array. While iterating over each individual array and manually adding items one by one is an option, this approach can be tedious and error-prone. Fortunately, JavaScript provides a more efficient solution.

Leveraging the concat Function

The concat function offers a concise way to combine the contents of multiple arrays. Simply pass the arrays to be concatenated as arguments to the function, and it will return a new array containing all the elements in sequence. For example:

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

The value of newArray will be [1, 2, 3, 4], with arrayA and arrayB remaining unchanged. The concat function operates on a copy of the input arrays, ensuring that the originals stay intact.

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