Run results for: Test replace vs substring vs slice for removing + from phone number

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36

Browser: Chrome 145

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one month ago

Test name	Executions per second
Replace	143.8 Ops/sec
Substring	964.6 Ops/sec
Substring hardcoded	728.9 Ops/sec
Slice	1379.6 Ops/sec
Slice hardcoded	725.1 Ops/sec

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

var numOfStrings = 100000
var prefix = '+'
var testStrings = []

function phones() {
   return Math.random() * (19999999999 - 10000000000) + 10000000000;
}

for (let i = 0; i < numOfStrings; i++) {
  testStrings.push(prefix + phones())
}

Tests:

Replace
testStrings.map(str => { return str.replace(/\D/g, ''); })
Substring
testStrings.map(str => { return str.substring(1, str.length) })
Substring hardcoded
testStrings.map(str => { return str.substring(1, 12) })
Slice
testStrings.map(str => { return str.slice(0, str.length) })
Slice hardcoded
testStrings.map(str => { return str.slice(0, 12) })

Run results for: Test replace vs substring vs slice for removing + from phone number

In Javascript

Replace

Substring

Substring hardcoded

Slice

Slice hardcoded