Benchmark: indexOf vs startsWidth vs includes

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)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
indexOf (start)
indexOf (end)
startsWith (start)
startsWith (end)
includes (start)
includes (end)

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 2 months ago)

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/OS: Chrome 121 on Mac OS X 10.15.7

View result in a separate tab

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

indexOf vs startsWidth vs includes (version: 0)

compare javascript string matching options

Comparing performance of: indexOf (start) vs indexOf (end) vs startsWith (start) vs startsWith (end) vs includes (start) vs includes (end)

Created: 2 months ago by: Guest

Jump to the latest result

indexOf (start)

indexOf (end)

startsWith (start)

startsWith (end)

includes (start)

includes (end)

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A