What\'s the Most Efficient Way to Create a Zero-Filled Array in JavaScript?

Most Efficient Way to Create a Zero Filled Array in JavaScript

It may be necessary in JavaScript to create an array of a specific length, with all its elements initialized to zero. This can be achieved in several ways, but some methods can be more resource-intensive or less clear than others.

Array.prototype.fill

The most efficient method, introduced in ES6, is to use the Array.prototype.fill method. It operates as follows:

new Array(len).fill(0);

Here, len represents the desired length of the zero-filled array. Array.prototype.fill accepts a single parameter, which specifies the value to fill each element with.

Example:

const myArray = new Array(5).fill(0);
console.log(myArray); // [0, 0, 0, 0, 0]

Other Methods

While using Array.prototype.fill is the preferred approach, there are alternative methods:

• Array.apply:

Array.apply(null, {length: len}).map(Function.prototype.call, Number.prototype.valueOf);

• new Array(len).fill():

[...Array(len)].map(() => 0);

• Array.from(Array(len), () => 0):

Array.from({length: len}, () => 0);

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