How to Replicate Array Elements in JavaScript?

Replicating Array Elements in JavaScript

In Python, multiplying a list by a number replicates its elements that many times. For instance, [2] * 5 yields [2, 2, 2, 2, 2]. Can we replicate this functionality in JavaScript using arrays?

Custom Function

One approach is to define a function like the following:

<code class="javascript">var repeatelem = function(elem, n){
    // returns an array with element elem repeated n times.
    var arr = [];

    for (var i = 0; i <= n; i++) {
        arr = arr.concat(elem);
    };

    return arr;
};

ES6 fill() Method

However, starting with ES6, JavaScript introduced the Array.fill() method, which provides a more concise and efficient solution:

<code class="javascript">console.log(
  Array(5).fill(2)
)
//=> [2, 2, 2, 2, 2]</code>

Here, Array(5) creates an empty array of length 5, and .fill(2) populates it with the provided element (2). This approach is both shorter and faster than the custom function, offering a clean and convenient way to replicate array elements in JavaScript.

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