Simple Mode

Answer

function SimpleMode(arr) {
  let map = {};

  for (let el of arr) {
    if (map[el]) map[el]++;
    else map[el] = 1;
  }

  let max = 1;
  let maxRes = -1;
  for (let [k, v] of Object.entries(map)) {
    if (v > max) {
      maxRes = k;
      max = v;
    }
  }

  if (max === 1) return -1;

  for (let el of arr) {
    if (map[el] === max) {
      maxRes = el;
      break;
    }
  }

  // code goes here
  return maxRes;
}
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