Run results for: replace vs split and join

Test the performance of replace() vs substring() vs slice() when replacing a char at the beginning of a (in this case uri query-)string that may or may not be there. Added the combined brackets[ ] + substr() method, since it's always the first char we wan't to pop off. Inspired by https://jsperf.com/replace-or-substr. Note: could not get 'let' and 'const' to work. Well, too bad...

Go to the benchmark

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:138.0) Gecko/20100101 Firefox/138.0

Browser: Firefox 138

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 15 days ago

Test name	Executions per second
replace inline regex	397090.9 Ops/sec
replace compiled regex var	395376.0 Ops/sec
split and join	319347.5 Ops/sec

Script Preparation code:

var strIn = '?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it?this=a+test&that=just+it';
var strOut = 'some';
var regex = /that/g;

Tests:

replace inline regex
strOut = strIn.replace(/that/g, '');
replace compiled regex var
strOut = strIn.replace(regex, '');
split and join
strOut = strIn.split('that').join('some')

Run results for: replace vs split and join

replace inline regex

replace compiled regex var

split and join