Benchmark: Spread vs Object.assign vs Object.keys with forEach (without new object)1

Tests:

Using the spread operator
let firstObject = { sampleData: 'Hello world' }; const secondObject = { moreData: 'foo bar' }; firstObject = { ...firstObject, ...secondObject };
Using Object.assign
let firstObject = { sampleData: 'Hello world' }; const secondObject = { moreData: 'foo bar' }; Object.assign(firstObject, secondObject);
Overriding the first object
let firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } Object.keys(secondObject).forEach(key => {firstObject[key] = secondObject[key] })

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Related benchmarks:

Spread vs Object.assign vs Object.keys with forEach (without new object)1 (version: 1)