Run results for: looking up the last character of a string - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36

Browser: Chrome 114

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
short endsWith	10728230.0 Ops/sec
short regexp	5168257.5 Ops/sec
short charAt	6016233.0 Ops/sec
short brackets	6068339.0 Ops/sec
short CharCodeAt	6948587.5 Ops/sec
short slice	11279383.0 Ops/sec
short substr	11591580.0 Ops/sec
short substring	5683681.5 Ops/sec
long endsWidth	10625112.0 Ops/sec
long regexp	5361100.0 Ops/sec
long charAt	6438410.5 Ops/sec
long brackets	6749972.5 Ops/sec
long charCodeAt	6710199.5 Ops/sec
long slice	12311986.0 Ops/sec
long substr	12470320.0 Ops/sec
long substring	6558480.0 Ops/sec

Script Preparation code:

var shortString = 'okay'.repeat(20); // 80 characters
var longString = shortString.repeat(1000000); // 80,000,000 characters

var re = /\n$/;

Tests:

short endsWith
shortString.endsWith('\n');
short regexp
re.test(shortString)
short charAt
shortString.charAt(shortString.length-1)==='\n'
short brackets
shortString[shortString.length-1]==='\n'
short CharCodeAt
shortString.charCodeAt(shortString.length-1)===13
short slice
shortString.slice(-1)==='\n'
short substr
shortString.substr(-1)==='\n'
short substring
shortString.substring(shortString.length-1)==='\n'
long endsWidth
longString.endsWith('\n');
long regexp
re.test(longString)
long charAt
longString.charAt(longString.length-1)==='\n'
long brackets
longString[longString.length-1]==='\n'
long charCodeAt
longString.charCodeAt(longString.length-1)===13
long slice
longString.slice(-1)==='\n'
long substr
longString.substr(-1)==='\n'
long substring
longString.substring(longString.length-1)==='\n'

;