Run results for: REPLACE STRSUBTR VS REGEX REPLACE

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:69.0) Gecko/20100101 Firefox/69.0

Browser: Firefox 69

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
str substr replace	139650.5 Ops/sec
regex replace	1409210.0 Ops/sec

Tests:

str substr replace
var x = 0; var TOTAL_STRINGS = 1000; var data = "00000000000000000000"; while (x < TOTAL_STRINGS) { const str = data.substr(0,5) + '1' + data.substr(6); x += 1; }
regex replace
var x = 0; var TOTAL_STRINGS = window.TOTAL_STRINGS; var data = "00000000000000000000"; const regex = /(\w{5})0(.*)/gm; const subst = `$11$2`; while (x < TOTAL_STRINGS) { const str = data.replace(regex,subst); x += 1; }