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Run results for: compare the ways to generate an empty array for iteration

- Array.apply: Array.apply(null, Array(100)) - Destructuring operator: [...Array(100)] - Array.prototype.fill Array(100).fill(undefined) - Array.from Array.from({ length: 100 })

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Run details:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:122.0) Gecko/20100101 Firefox/122.0
Firefox 122
Windows
Desktop
9 months ago
Test name Executions per second
Array.apply(null, Array(n)) 20427.8 Ops/sec
[...Array(n)] 58716.1 Ops/sec
Array(n).fill(null) 95004.9 Ops/sec
Array.from({ length: n }) 94368.3 Ops/sec
Array.from({ length:n }, (item, i) => i) 123275.3 Ops/sec
Tests:

  • Array.apply(null, Array(n))

  • [...Array(n)]

  • Array(n).fill(null)

  • Array.from({ length: n })

  • Array.from({ length:n }, (item, i) => i)

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