Padding a string with random lowercase alphabets to fill length in JavaScript

We are required to write a function that takes in two arguments, first is a string and second is a number. The length of string is always less than or equal to the number. We have to insert some random lowercase alphabets at the end of the string so that its length becomes exactly equal to the number and we have to return the new string.

Example

Let’s write the code for this function −

const padString = (str, len) => {
   if(str.length < len){
      const random = Math.floor(Math.random() * 26);
      const randomAlpha = String.fromCharCode(97 + random);
      return padString(str + randomAlpha, len);
   };
   return str;
};
console.log(padString('abc', 10));
console.log(padString('QWERTY', 10));
console.log(padString('HELLO', 30));
console.log(padString('foo', 10));

Output

The output in the console −

abckoniucl
QWERTYcwaf
HELLOdnulywbogqhypgmylqlvmckhg
Foofhfnhon