Benchmark: JavaScript Object spread operator vs manual assignment

Tests:

Using spread syntax
const input = { data1: '1', data2: '2', data3: '3', data4: '4' } const output = { ...input }; output.data5 = '5'
Using manual assignment
const input = { data1: '1', data2: '2', data3: '3', data4: '4' } const output = { data1: input.data1, data2: input.data2, data3: input.data3, data4: input.data4, }; output.data5 = '5'

Rendered benchmark preparation results:

Previous results

Test case name	Result
Using spread syntax
Using manual assignment

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Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/110.0

Browser/OS: Firefox 110 on Ubuntu

Test name	Executions per second
Using spread syntax	2779092.0 Ops/sec
Using manual assignment	15132890.0 Ops/sec

JavaScript Object spread operator vs manual assignment (version: 0)