Benchmark: Concatenation vs Find and Substring

Script Preparation code:

var string = "HelloWorld!".repeat(200) + " 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 and Substring
for (let i = 0; i < 200; ++i) { let j; for (j = 0; j < string.length; ++j) { if (' ' === string[j]) { let result = string.substring(0, j); break; } } }

Rendered benchmark preparation results:

Previous results

Test case name	Result
Concat
Find and Substring

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Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:87.0) Gecko/20100101 Firefox/87.0

Browser/OS: Firefox 87 on Ubuntu

Test name	Executions per second
Concat	63.0 Ops/sec
Find and Substring	95.7 Ops/sec

Concatenation vs Find and Substring (version: 0)