Run results for: Concatenation vs substring

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/117.0.0.0 Safari/537.36

Browser: Chrome 117

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 7 months ago

Test name	Executions per second
Concat	27.3 Ops/sec
Find & Substring	41.2 Ops/sec

Script Preparation code:

var string = "HelloWorld!".repeat(100) + " Hi";

Tests:

Concat
for (let i = 0; i < 200; ++i) { let result = ''; for (let j = 0; j < string.length; ++j) { if (' ' === string[j]) { break; } result += string[j]; } }
Find & Substring
for (let i = 0; i < 200; ++i) { let j; for (j = 0; j < string.length; ++j) { if (' ' === string[j]) { break; } } let result = string.substring(0, j); }