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JavaScript - String padStart() method example

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Created by:

Inayah-Alexander

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const text = 'A';
​
console.log(text.padStart(1, '*')); // A
console.log(text.padStart(2, '*')); // *A
console.log(text.padStart(3, '*')); // **A

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1. Documentation

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Syntax	`String` `padStart(maxLength)` `String` `padStart(maxLength, fillString)`
Parameters	`maxLength`- the length of the resulting string once the current string has been padded. `fillString` - The string to pad the current string with.
Result	A String of the specified `maxLength` with `fillString` applied from the start.
Description	The method pads the current string with a given string (possibly repeated) so that the resulting string reaches a given length. The padding is applied from the start (left) of the current string.

2. Practical example

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In this example, we pad a number to keep only the last 3 digits.

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const number = '123456789';
const last3Digits = number.slice(-3);
const maskedNumber = last3Digits.padStart(number.length, '*');
​
console.log(maskedNumber);