Benchmark: flatMap vs reduce with desctructuring vs reduce without desctructuring

Script Preparation code:

var arr = Array(10_000).fill(0)

Tests:

reduce with concat without destructuring
arr.reduce((acc, x) => acc.concat(x).concat(x), [])
flatMap
arr.flatMap(x => [x, x])
reduce with concat with destructuring
arr.reduce((acc, x) => [...acc, x, x], [])

Rendered benchmark preparation results:

Previous results

Test case name	Result
reduce with concat without destructuring
flatMap
reduce with concat with destructuring

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Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36 Edg/126.0.0.0

Browser/OS: Chrome 126 on Windows

Test name	Executions per second
reduce with concat without destructuring	1.4 Ops/sec
flatMap	4694.7 Ops/sec
reduce with concat with destructuring	18.9 Ops/sec

flatMap vs reduce with desctructuring vs reduce without desctructuring (version: 0)