Highest occurrence in an array or first selected in JavaScript

We are required to write a JavaScript function that takes in an array of literal values. Our function should then return the highest occurrence of an array value, and if there's an equal occurrence, we should return the first selected value of the equal occurrences.

const arr = ['25', '50', 'a', 'a', 'b', 'c']

In this case, we should return 'a'

const arr = ['75', '100', 'a', 'b', 'b', 'a']

In this case, I should also get 'a'

Example

The code for this will be −

const arr = ['25', '50', 'a', 'a', 'b', 'c'];
const arr1 = ['75', '100', 'a', 'b', 'b', 'a'];
const getMostFrequentValue = (arr = []) => {
   let count = 0, ind = -1;
   arr.forEach((el, i) => {
      this[el] = this[el] || { count: 0, ind: i };
      this[el].count++;
      if (this[el].count > count) {
         count = this[el].count;
         ind = this[el].ind;
         return;
      };
      if (this[el].count === count && this[el].ind < ind) {
         ind = this[el].ind;
      };
   }, Object.create(null));
   return arr[ind];
};
console.log(getMostFrequentValue(arr));
console.log(getMostFrequentValue(arr1));

Output

And the output in the console will be −

a
a

AmitDiwan

Published on 24-Nov-2020 09:51:54