Benchmark: eliya and sharon :) v3

Script Preparation code:

var arr = Array(100_000_000).fill({entities:[1,2]})

Tests:

reduce with push
arr.reduce((acc, { entities }) => { const newE = entities.map((x) => x); acc.push(...newE); return acc; }, []);
flatMap
arr.flatMap(({ entities }) => entities.map((x) => x));
reduce with concat
arr.reduce((acc, { entities }) => { const newE = entities.map((x) => x); acc.concat(newE); return acc; }, []);

Rendered benchmark preparation results:

Previous results

Latest run results:

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eliya and sharon :) v3 (version: 1)