Benchmark: Spacing numbers every 3 digits

Tests:

Using map+reverse+join
"112345678".split("").reverse().map((x,i)=>{ if((i + 1) % 3 === 0){ return " "+x; } else { return x; } }).reverse().join("").trim();
Using reduce
"12345678" .split("") .reverse() .reduce((acc, cur, i) => (((i + 1) % 3 === 0 ? ' ' : '') + cur + acc) , "").trim();

Rendered benchmark preparation results:

Previous results

Test case name	Result
Using map+reverse+join
Using reduce

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Latest run results:

Run details: (Test run date: 6 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:62.0) Gecko/20100101 Firefox/62.0

Browser/OS: Firefox 62 on Linux

Test name	Executions per second
Using map+reverse+join	1751516.0 Ops/sec
Using reduce	2857580.0 Ops/sec

Spacing numbers every 3 digits (version: 0)