Run results for: indexOf vs startsWidth vs includes

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36

Browser: Chrome 121

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 months ago

Test name	Executions per second
indexOf (start)	3732.1 Ops/sec
indexOf (end)	3729.3 Ops/sec
startsWith (start)	2292.4 Ops/sec
startsWith (end)	3430.0 Ops/sec
includes (start)	3705.3 Ops/sec
includes (end)	3708.8 Ops/sec

Script Preparation code:

var sub = "(sub)";
var textsStart = [];
var textsEnd = [];
for(var i = 0; i < 10000; i++) {
  textsStart.push(`${sub} My ${i} test sample which contains sub at the end`)
  textsEnd.push(`My ${i} test sample which contains sub at the end ${sub}`)
}

Tests:

indexOf (start)
for(const textStart of textsStart) textStart.indexOf(sub)
indexOf (end)
for(const textEnd of textsEnd) textEnd.indexOf(sub)
startsWith (start)
for(const textStart of textsStart) textStart.startsWith(sub)
startsWith (end)
for(const textEnd of textsEnd) textEnd.startsWith(sub)
includes (start)
for(const textStart of textsStart) textStart.includes(sub)
includes (end)
for(const textEnd of textsEnd) textEnd.includes(sub)

Run results for: indexOf vs startsWidth vs includes

compare javascript string matching options

indexOf (start)

indexOf (end)

startsWith (start)

startsWith (end)

includes (start)

includes (end)