Benchmark: Array extension techniques

Array extension techniques (version: 1)

Script Preparation code:

const batches = []
for (let i = 0; i < 1000; i++) {
  batches.push(new Array(10).fill(i))
}

Tests:

repeated spread -- output = [...output, ...batch]
let result = [] for (const batch of batches) { result = [...result, ...batch] } return result
repeated concat -- output = output.concat(batch)
let result = [] for (const batch of batches) { result = result.concat(batch) } return result
spread concat -- output = [].concat(...batches)
let result = [] result = result.concat(...batches) return result
push spread -- output.push(...batch)
let result = [] for (const batch of batches) { result.push(...batch) } return result
push loop -- for (const v of batch) { output.push(v) }
let result = [] for (const batch of batches) { for (const v of batch) { result.push(v) } } return result

Rendered benchmark preparation results:

Previous results

Test case name	Result
repeated spread -- output = [...output, ...batch]
repeated concat -- output = output.concat(batch)
spread concat -- output = [].concat(...batches)
push spread -- output.push(...batch)
push loop -- for (const v of batch) { output.push(v) }

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:138.0) Gecko/20100101 Firefox/138.0

Browser/OS: Firefox 138 on Windows

Test name	Executions per second
repeated spread -- output = [...output, ...batch]	13.7 Ops/sec
repeated concat -- output = output.concat(batch)	68.3 Ops/sec
spread concat -- output = [].concat(...batches)	9530.2 Ops/sec
push spread -- output.push(...batch)	7373.5 Ops/sec
push loop -- for (const v of batch) { output.push(v) }	5661.3 Ops/sec

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