Question

How to add leading zeros to the shorter string of two strings in JavaScript

Answer 1

function addLeadingZero(str1, str2) {
    const len1 = str1.length;
    const len2 = str2.length;

    let strToPad = "";

    const diff = Math.abs(len1 - len2);

    if (diff > 0) {
        strToPad = "0".repeat(diff);
        if (len1 > len2) {
            strToPad += str2;
        } else {
            strToPad += str1;
        }
    }

    return strToPad;
}

let str1 = "123";
let str2 = "8976753";

if (str1.length > str2.length) {
    str2 = addLeadingZero(str1, str2);
} else {
    str1 = addLeadingZero(str1, str2);
}

console.log(str1);
console.log(str2);




/*
run:

0000123
8976753

*/

 

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