Matching strings for similar characters - JavaScript

We are required to write a JavaScript function that accepts two string and a number n.

The function matches the two strings i.e., it checks if the two strings contains the same characters.

The function returns true if both the strings contain the same character irrespective of their order or if they contain at most n different characters, else the function should return false.


Following is the code −

const str = 'some random text';
const str2 = 'some r@ndom text';
const deviationMatching = (first, second, num) => {
   let count = 0;
   for(let i = 0; i < first.length; i++){
      if(count > num){
         return false;
   return true;
console.log(deviationMatching(str, str2, 1));


This will produce the following output in console −