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Rohit Kumawat
Rohit Kumawat

Posted on • Updated on

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
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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 💻
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Discussion (1)

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Comment marked as low quality/non-constructive by the community. View Code of Conduct
Mike Lezhnin • Edited on

I really wonder why you even wrote this post.