Array vs. object large
Date tested:
one year ago
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/102.0.0.0 Safari/537.36
Test name
Executions per second
Object lookup
9487419.0 Ops/sec
Array lookup
26984160.0 Ops/sec
Benchmark definition (click to collapse):
Script Preparation code:
function createLargeArray() { return new Array(1000).fill(undefined).map((_, i) => i); } function createLargeObject() { return createLargeArray().reduce((acc, val) => { acc[val] = val % 2 ? true : false; return acc }, {}) } var obj = createLargeObject(); var arr = createLargeArray();
Tests:
Object lookup
obj[500] !== undefined
Array lookup
arr.includes(500)
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