Run results for: Map has vs array some in loop

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.101 Safari/537.36

Browser: Chrome 91

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Array some	131310.8 Ops/sec
Map has	111914.5 Ops/sec

Tests:

Array some
const referenceArray = [ {id:1},{id:2},{id:3},{id:4},{id:5},{id:6},{id:7},{id:8},{id:9},{id:0} ]; const inputArray = [ {id:5},{id:1},{id:10},{id:9},{id:5},{id:2},{id:17},{id:0},{id:4},{id:0} ]; inputArray.map(inp => ({...inp, isExisting: referenceArray.some(refA => refA.id === inp.id)}));
Map has
const referenceArray = [ {id:1},{id:2},{id:3},{id:4},{id:5},{id:6},{id:7},{id:8},{id:9},{id:0} ]; const inputArray = [ {id:5},{id:1},{id:10},{id:9},{id:5},{id:2},{id:17},{id:0},{id:4},{id:0} ]; const x = referenceArray.reduce((mapI, inp) => mapI.set(inp.id,inp), new Map()); inputArray.map(inp => ({...inp, isExisting: x.has(inp.id)}));