How to Efficiently Pad Numbers with Leading Zeros in JavaScript?

Efficiently Padding Values with Leading Zeros in JavaScript

In JavaScript, there are various ways to pad a value with leading zeros. One common approach involves creating a custom function that concatenates a string of zeros to a typecasted value. However, a more straightforward method exists.

To pad a value efficiently, simply concatenate the desired number of zeros to the value using the ' ' operator. The result is a string with the trailing zeros. Next, use the slice() method to extract the specified number of characters from the end of the string. This approach provides a concise and effective solution.

An example showcasing this method:

let n = 1;
var zerofilled = ('0000' + n).slice(-4);
console.log(zerofilled); // Output: '0001'

In this example, the value of n (1) is padded with three leading zeros to create a 4-digit string ('0001'). By using the slice() method, only the last four characters are extracted and assigned to the zerofilled variable.

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