Benchmark: Case insensitive string comparison: toLowerCase vs localeCompare vs toUpperCase - MeasureThat.net

Script Preparation code:

var a = "John Doe"
var b = "john doe"
var c = "john smith"
var o = {
    sensitivity: 'base'
}

Tests:

toLowerCase()
a.toLowerCase() === b.toLowerCase()
localeCompare()
a.localeCompare(b,undefined,o)
toLowerCase() FAIL
c.toLowerCase() === b.toLowerCase()
localeCompare() FAIL
c.localeCompare(b,undefined,o)
toUpperCase()
a.toUpperCase() === b.toUpperCase()
toUpperCase() FAIL
c.toUpperCase() === b.toUpperCase()

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
toLowerCase()
localeCompare()
toLowerCase() FAIL
localeCompare() FAIL
toUpperCase()
toUpperCase() FAIL

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/109.0.0.0 Safari/537.36

Browser/OS: Chrome 109 on Windows

View result in a separate tab

Test name	Executions per second
toLowerCase()	10032700.0 Ops/sec
localeCompare()	204295.2 Ops/sec
toLowerCase() FAIL	9071660.0 Ops/sec
localeCompare() FAIL	206662.9 Ops/sec
toUpperCase()	8844617.0 Ops/sec
toUpperCase() FAIL	8664905.0 Ops/sec