Benchmark: Reduce with spread operator vs without on a large array 2

Script Preparation code:

var array = new Array(10000).fill(1)

function withSpread(item, index) {
    return {
        [`group${index}`]: {
            id: index,
            timestamp: new Date(new Date().getTime() + (index * 1000)),
            isOdd: index % 2 === 0,
            isEven: index % 2 !== 0
        }
    }

}

function withOutSpread(acc, item, index) {
    acc[index] = {
        id: index,
        timestamp: new Date(new Date().getTime() + (index * 1000)),
        isOdd: index % 2 === 0,
        isEven: index % 2 !== 0
    }
    return acc;
}

Tests:

reduce with spread
Object.assign({}, ...array.map(withSpread))
reduce without spread
array.reduce(withOutSpread, {})

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
reduce with spread
reduce without spread

Fastest: N/A

Slowest: N/A

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Latest run results:

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

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Mobile Safari/537.36

Browser/OS: Chrome Mobile 122 on Android

View result in a separate tab

Test name	Executions per second
reduce with spread	36.7 Ops/sec
reduce without spread	118.3 Ops/sec

Reduce with spread operator vs without on a large array 2 (version: 0)

Reduce with spread operator vs without on a large array

Comparing performance of: reduce with spread vs reduce without spread

Created: one month ago by: Guest

Jump to the latest result

reduce with spread

reduce without spread

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A