Question

How to add leading zeros to the shorter string of two strings in Node.js

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 = "789";
let str2 = "1298653";
 
if (str1.length > str2.length) {
    str2 = addLeadingZero(str1, str2);
} else {
    str1 = addLeadingZero(str1, str2);
}
 
console.log(str1);
console.log(str2);
 
 
 
 
/*
run:
 
0000789
1298653
 
*/

 

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