Run results for: last number checker - !

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36

Browser: Chrome 105

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
number list string slice	3313417.0 Ops/sec
number list number divide	3343745.0 Ops/sec
string list string indexing	3785295.0 Ops/sec

Script Preparation code:

var DEFAULT_COHORT_TEST_IDS = [0, 1, 2, 3, 4];
var DEFAULT_COHORT_TEST_IDS_STR = ['0', '1', '2', '3', '4'];
var getLastTokenOfString = (str) => {
  if (!str || typeof str !== 'string') return null;

  return str[str.length - 1];
};

Tests:

number list string slice
DEFAULT_COHORT_TEST_IDS.includes(Number(String(1234).slice(-1)))
number list number divide
DEFAULT_COHORT_TEST_IDS.includes(Number(String(1234)) & 10)
string list string indexing
DEFAULT_COHORT_TEST_IDS_STR.includes(getLastTokenOfString(String(1234)))

Run results for: last number checker - !

number list string slice

number list number divide

string list string indexing