Benchmark: Create vs Mutate Object 2

Script Preparation code:

var collection = new Array(10000).map(item => ({a:null, b:null, c:null}))

Tests:

Create new object
collection.map(() => { return {a:1, b:1, c:1} })
Mutate object
collection.map((obj) => { obj.a = 1 obj.b = 1 obj.c = 1 return obj })
Destructure
collection.map((obj) => { return {...obj, a:1, b:1, c:1} })
Add new properties
collection.map((obj) => { obj.d = 1 obj.e = 1 obj.f = 1 return obj })
Just mutate in-place
collection.forEach((obj) => { obj.a = 1 obj.b = 1 obj.c = 1 })

Rendered benchmark preparation results:

Previous results

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Related benchmarks:

Create vs Mutate Object 2 (version: 3)