reduce

by Jithin Raj P R

JavaScript

const toConvert = [2, 3, 4, 5, 5, 5, 6, 7, 2, 7]

function letsTry(arr) {
  return arr.reduce((a, b) => {
    a[b] = (a[b] | 0) + 1;
    return a;
  }, {});
}

console.log(letsTry(toConvert));

// output {
//   2: 2,
//   3: 1,
//   4: 1,
//   5: 3,
//   6: 1,
//   7: 2,
// }