get most occurring elements in array JavaScript

Question

I have an array that I want to get the most occurring elements,

First scenario

let arr1 = [\'foo\', \'foo\', \'foo\', \         


        

Answer 1

You can count the items with reduce and find the maximum occurring count. Then you can filter any keys that have that count:

let arr = ['foo', 'foo', 'foo', 'bar', 'bar', 'bar', 'baz', 'baz'];

let counts = arr.reduce((a, c) => {
  a[c] = (a[c] || 0) + 1;
  return a;
}, {});
let maxCount = Math.max(...Object.values(counts));
let mostFrequent = Object.keys(counts).filter(k => counts[k] === maxCount);

console.log(mostFrequent);