Run results for: Split Join vs Basic string replace

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:64.0) Gecko/20100101 Firefox/64.0

Browser: Firefox 64

Operating system: Windows

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Replace (SIMPLE)	80754270.0 Ops/sec
Split and Join	85080800.0 Ops/sec
Replace (REGEX)	25949.4 Ops/sec

Script Preparation code:

var str = 'Abcd efghij klmnopqrstuv wxy Abcd efghij klmnopqrstuv wxy Abcd efghij klmnopqrstuv wxyAbcd efghij klmnopqrstuv wxy Abcd efghij klmnopqrstuv wxy Abcd efghij klmnopqrstuv wxy';

Tests:

Replace (SIMPLE)
str.replace("m", "$&Z");
Split and Join
str.split('').join('Z') + 'Z';
Replace (REGEX)
str.replace(/./g, "$&Z");

Run results for: Split Join vs Basic string replace

Replace (SIMPLE)

Split and Join

Replace (REGEX)