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Run results for:
Array.from vs Array.fill (with correct length)
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Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:134.0) Gecko/20100101 Firefox/134.0
Browser:
Firefox 134
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
from
166.5 Ops/sec
fill
112.0 Ops/sec
Tests:
from
let n = 10000, length = 100 let dontOptimizeMeBro = 0; for (let i = 0; i < n; ++i) { dontOptimizeMeBro += Array.from({length:length}).map((_, i) => i + 1).at(-1); } console.log(dontOptimizeMeBro)
fill
let n = 10000, length = 100 let dontOptimizeMeBro = 0; for (let i = 0; i < n; ++i) { dontOptimizeMeBro += Array(length).fill(0).map(i => i + 1).at(-1); } console.log(dontOptimizeMeBro)