Benchmark: Map vs Vanilla For vs For Of 1000

Script Preparation code:

var objects = new Array(100000);
objects.fill({key: 'derp'});

Tests:

Map with clone
objects.map((obj) => { obj = Object.assign({}, obj); obj.group = 'grouping'; return obj; })
Map
objects.map((obj) => { obj.group = 'grouping'; return obj; })
Vanilla For
for (let i = 0; i < objects.length; i++) { objects[i].group = 'grouping'; }
For Of
for (const obj of objects) { obj.group = 'grouping'; }

Rendered benchmark preparation results:

Previous results

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Related benchmarks:

Map vs Vanilla For vs For Of 1000 (version: 0)