Run results for: Find the stray_eric

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:67.0) Gecko/20100101 Firefox/67.0

Browser: Firefox 67

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
stray_happy	699676.8 Ops/sec
stray_heretic	10020.9 Ops/sec
stray_shaye	420376.9 Ops/sec
stray_user	1198324.0 Ops/sec
stray_eric	1367125.0 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_eric(numbers) {
  if (numbers[0] != numbers[1]){
    if (numbers[1] != numbers[2]){
      return numbers[1];
    } else {
      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;

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_eric
var n = stray_eric(numbers)