Benchmark: string concatenation += vs Array.prototype.join()

Tests:

+=
let s = ''; for (let i = 0; i < 10000; ++i) { s += i; } const t = s;
Array.prototype.join
let s = []; for (let i = 0; i < 10000; ++i) { s.push(i); } const t = s.join('');

Rendered benchmark preparation results:

Previous results

Test case name	Result
+=
Array.prototype.join

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Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/113.0

Browser/OS: Firefox 113 on Mac OS X 10.15

Test name	Executions per second
+=	3700.6 Ops/sec
Array.prototype.join	6810.6 Ops/sec

string concatenation += vs Array.prototype.join() (version: 0)