Question

How to left pad a number with zeros in JavaScript

Answer 1

function LeftPadWithZeros(n, len) {
    let s = '' + n;
    
    while (s.length < len) {
        s = '0' + s;
    }
 
    return s;
}
         

console.log(LeftPadWithZeros(17493, 8));



/*
run:

00017493

*/

 

70+ SQL courses for beginners and professionals

Answer 2

let n = 17493;

// padStart(targetLength, padString)

console.log(String(n).padStart(8, '0'));



/*
run:

00017493

*/

 

70+ SQL courses for beginners and professionals

Answer 3

function LeftPadWithChar(n, len, padch = '0') {
    n = n + '';
     
    return n.length >= len ? n : new Array(len - n.length + 1).join(padch) + n;
}
 
let num = 17493;
 
console.log(LeftPadWithChar(num , 8));
 
 
 
/*
run:
 
00017493
 
*/

 

70+ SQL courses for beginners and professionals