function stray_happy(numbers) {

  numbers = numbers.sort((a, b) => a - b);

  if (numbers[0] !== numbers[1]) {

    return numbers[0];

  }

  else {

    return numbers[numbers.length - 1];

  }

}

​

​

function stray_heretic(numbers) {

  return numbers.find(i => numbers.filter(j => j === i).length === 1);

}

​

​

function stray_shaye(numbers) {

  return +numbers.sort((a, b) => a - b)

    .filter((n,i,a) => (i === 0 && a[0] !==a[1]) || (i === a.length-1 && a[a.length-1] !== a[a.length-2]));

}

​

function stray_user(a) {

  return a.find(v => a[0] != a[1] ? v != a[2] : v != a[0])

}

​

function stray_eric(numbers) {

  if (numbers[0] != numbers[1] && numbers[0] != numbers[2]){

      return numbers[0];

  }

  return numbers.find(i => i !== numbers[0]);

}

​

N = 100

var numbers = Array(N).fill(1);

numbers[Math.floor(Math.random()*N)] = 2;

​

​