How to check if the occurrence of letters in the given string is the same

Problem statement: We have to check if all letters in a given string occurred same times.

Examples:

• dev has three letters and all appeared 1 time. So it will return true.
• aabbcc has three letters and all appeared 2 times. So it will return true.
• xyyzzz has three letters and x appeared 1 time, y 2 times, and z 3 times. So it will return false.

Solution:

const str = "aabbcc";
const tracker = {};

for(let i = 0; i < str.length; i++) {
  if(!tracker[str[i]]) {
    tracker[str[i]] = 1;
  } else if (tracker[str[i]]) {
    tracker[str[i]]++;
  }
}

const repeatCount = Object.values(tracker);
const isTrue = repeatCount.every(el => el === repeatCount[0]);

console.log("same occurrence for all letters", isTrue); //true

In this solution:

• We used for loop and check for each letter's occurrence.
• Then we kept track of every letter's occurrence in an object.
• And finally, we checked if the occurrence number is the same for all letters.
• Time complexity for this solution is O(n).

---

Conclusion:

There are many solutions to this problem. This is just one of them. I will be adding different solutions in the future in the same post.

Thanks for reading and Happy coding 💻
For more tech and F.R.I.E.N.D.S. discuss, let's connect on Twitter.