Benchmark: Spread vs Object.assign for mapping arrays into objects

Tests:

Spread
const data = [ ["test1", 1], ["test2", 2], ["test3", 3], ["test4", 4], ["test5", 5], ["test6", 6], ["test7", 7], ["test8", 8], ["test9", 9], ] const res = data.reduce((acc, item) => ({...acc, [item[0]]: item[1]}), {})
Object assign
const data = [ ["test1", 1], ["test2", 2], ["test3", 3], ["test4", 4], ["test5", 5], ["test6", 6], ["test7", 7], ["test8", 8], ["test9", 9], ] const res = data.reduce((acc, item) => {Object.assign(acc, {[item[0]]: item[1]}); return acc;}, {})

Rendered benchmark preparation results:

Previous results

Test case name	Result
Spread
Object assign

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Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Firefox/68.0

Browser/OS: Firefox 68 on Linux

Test name	Executions per second
Spread	108207.1 Ops/sec
Object assign	150927.7 Ops/sec

Spread vs Object.assign for mapping arrays into objects (version: 0)