Question

How to add N zeros to an empty string in JavaScript

Answer 1

function padLeft(str, length, char) {
    return char.repeat(Math.max(0, length - str.length)) + str;
}

const n = 4;
let emptyString = "";

emptyString = padLeft(emptyString, n, '0');

console.log(emptyString);




/*
run:

0000

*/

 

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Answer 2

function padLeftZeros(str, length) {
    return "0".repeat(length);
}
 
const n = 4;
let emptyString = "";
 
emptyString = padLeftZeros(emptyString, n);
 
console.log(emptyString);
 
 
 
 
/*
run:
 
0000
 
*/

 

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