Run results for: Find the stray v2

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:67.0) Gecko/20100101 Firefox/67.0

Browser: Firefox 67

Operating system: Mac OS X 10.14

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
stray_happy	3918864.0 Ops/sec
stray_heretic	755777.8 Ops/sec
stray_shaye	1436018.0 Ops/sec
stray_user	13068000.0 Ops/sec
stray_user_2	21585770.0 Ops/sec

Script Preparation code:

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_user_2(a) {
	a.find(a[0] != a[1] ? (v, i, a) => v != a[2] : (v, i, a) => v != a[0])
}

var numbers = [1,1,1,1,1,1,1,2,1,1,1,1,1,1,1]

Tests:

stray_happy
var n = stray_happy(numbers)
stray_heretic
var n = stray_heretic(numbers)
stray_shaye
var n = stray_shaye(numbers)
stray_user
var n = stray_user(numbers)
stray_user_2
var n = stray_user_2(numbers)