Run results for: RegExp.exec vs String.match +

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:88.0) Gecko/20100101 Firefox/88.0

Browser: Firefox 88

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
exec	43601.8 Ops/sec
match + map + N x match	562368.1 Ops/sec

Script Preparation code:

var fnSelectorStr = "functionsomethingreturnsomething.foo['bar']['barz'].bar_again['foo_again']['barz-again']['idk']";

var RE_MATCH = /(?:(?<=\[)(['"]).*?\1)|(?:(?<=\.)[^.[]+)/g;
var RE_EXEC = /(?:(?<=\[)(['"])(.*?)\1)|(?:(?<=\.)[^.[]+)/g;

Tests:

exec
var matches = RE_EXEC.exec(fnSelectorStr); var members = []; do { var propFound = matches[2] === undefined ? matches[0] : matches[2]; members.push(propFound); } while ((matches = RE_EXEC.exec(fnSelectorStr)) !== null); console.log(members);
match + map + N x match
var matches = fnSelectorStr.match(RE_MATCH); if (matches) { var RE_HAS_QUOTES = /^(['"]).*\1$/; return matches.map(function(match){ return match.match(RE_HAS_QUOTES) ? match.slice(1, -1) : match; }); }

Run results for: RegExp.exec vs String.match +

not realistic benchmark to adress https://github.com/nartc/mapper/pull/293

exec

match + map + N x match