What I've done today is Find The Parity Outlier in JavaScript.

CodeWars

Problem

Find The Parity Outlier

You are given an array (which will have a length of at least 3, but could be very large) containing integers. The array is either entirely comprised of odd integers or entirely comprised of even integers except for a single integer N. Write a method that takes the array as an argument and returns this "outlier" N.

Examples

[2, 4, 0, 100, 4, 11, 2602, 36]
Should return: 11 (the only odd number)

[160, 3, 1719, 19, 11, 13, -21]
Should return: 160 (the only even number)

Solution

function findOutlier(integers){
  odd = integers.filter(a => a&1);
  even = integers.filter(a => ~a&1);
  return odd.length===1?odd[0]:even[0];
}

function findOutlier(integers){
  return integers
    .slice(0, 3)
    .filter(a => a&1)
    .length<2?
    integers.find(a => a&1):
    integers.find(a => ~a&1);
}