Run results for: tests fir startwith polyfills

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36

Browser: Chrome 55

Operating system: Windows 7

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
startWith native	1767440.5 Ops/sec
indexof	1282136.9 Ops/sec
lastIndexOf	1569441.4 Ops/sec
regex	1631895.9 Ops/sec
substr	1418105.8 Ops/sec

Script Preparation code:

var searchInMe = 'IstartwithIstartwithIstartwithIstartwithIstartwithIstartwithIstartwithIstartwithIstartwithIstartwithIstartwithIstartwith';
var searchInMe2 = 'InotstartwithInotstartwithInotstartwithInotstartwithInotstartwithInotstartwithInotstartwithInotstartwithInotstartwith11';
var searchForMe = 'Istartwith';
var searchForMeEr = /^Istartwith/;

Tests:

startWith native
searchInMe.startsWith(searchForMe); searchInMe2.startsWith(searchForMe);
indexof
searchInMe.indexOf(searchForMe) === 0; searchInMe2.indexOf(searchForMe) === 0;
lastIndexOf
searchInMe.lastIndexOf(searchForMe, 0) === 0; searchInMe2.lastIndexOf(searchForMe, 0) === 0;
regex
searchForMeEr.test(searchInMe); searchForMeEr.test(searchInMe2);
substr
searchInMe.substr(0, searchForMe.length) === searchForMe; searchInMe2.substr(0, searchForMe.length) === searchForMe;

Run results for: tests fir startwith polyfills

startWith native

indexof

lastIndexOf

regex

substr