Benchmark: Spread vs FlatMap

Script Preparation code:

const arr = Array.from({
    length: 5
}).map((_, index) => ({
    id: index,
    label: `lbl`,
    plate: `plt`
}));

Tests:

Spread
let x = [...arr?.map((item) => ({ ...item, label: item.label, value: item.id, })), ...arr?.map((item) => ({ ...item, label: item.plate, value: item.id, })),]
FlatMap
let y = arr?.flatMap((item) => [ { ...item, label: item.label, value: item.id }, { ...item, label: item.oldLicensePlate, value: item.id }, ])

Rendered benchmark preparation results:

Previous results

Test case name	Result
Spread
FlatMap

Latest run results:

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Spread vs FlatMap (version: 1)