Run results for: String search vs Array search vs Obj key search

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:139.0) Gecko/20100101 Firefox/139.0

Browser: Firefox 139

Operating system: Windows

Device Platform: Desktop

Date tested: 11 months ago

Test name	Executions per second
String search	38484048.0 Ops/sec
Array search	1980257.4 Ops/sec
Obj key search	6117933.0 Ops/sec

Script Preparation code:

function strMonth(str) {
  const months3 = "jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec|янв|фев|мар|апр|май|июн|июл|авг|сен|окт|ноя|дек";
  return Math.floor(months3.indexOf(str.slice(0, 3).toLowerCase()) / 4) % 12 + 1
}
function arrMonth(str) {
  const months3 = ["jan","feb","mar","apr","may","jun","jul","aug","sep","oct","nov","dec","янв","фев","мар","апр","май","июн","июл","авг","сен","окт","ноя","дек"];
  return Math.floor(months3.indexOf(str.slice(0, 3).toLowerCase()) % 12 + 1);
}
function objMonth(str) {
  const months3 = { jan:1,feb:2,mar:3,apr:4,may:5,jun:6,jul:7,aug:8,sep:9,oct:10,nov:11,dec:12,янв:1,фев:2,мар:3,апр:4,май:5,июн:6,июл:7,авг:8,сен:9,окт:10,ноя:11,дек:12 };
  return months3[str.slice(0, 3).toLowerCase()];
}

Tests:

String search
strMonth("apr"); strMonth("dec"); strMonth("дек");
Array search
arrMonth("apr"); arrMonth("dec"); arrMonth("дек");
Obj key search
objMonth("apr"); objMonth("dec"); objMonth("дек");