Run results for: Shitloads of if statements vs includes

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36

Browser: Chrome 66

Operating system: Mac OS X 10.13.4

Device Platform: Other

Date tested: 6 years ago

Test name	Executions per second
Shitloads of Ifs	1651287.4 Ops/sec
Includes	1529847.5 Ops/sec
Object lookup	1305150.4 Ops/sec
Set	1694884.2 Ops/sec

Script Preparation code:

var val = 9998;
var arr = Array.from({ length: 10000 }).map((val, index) => index);
var obj = arr.reduce((obj, val) => ({ ...obj, [val]: 1}), {});
var set = new Set(arr);
var check = function() {
  var i = 0;
  while (i++ < arguments.length) {
    if (arguments[i] === val) { return true; }
  }
  return false;
}

Tests:

Includes
var found = arr.includes(val);
Object lookup
var found = obj[val] !== undefined;
Set
var found = set.has(val);
Arguments
var found = check.apply(null, arr);

Run results for: Shitloads of if statements vs includes

Includes

Object lookup

Set

Arguments