Benchmark: concat vs spread vs push

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

function generateID(length = 10) {
    const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
    let result = '';
    const charactersLength = characters.length;
    
    for (let i = 0; i < length; i++) {
        // Generate a random index based on characters length
        const randomIndex = Math.floor(Math.random() * charactersLength);
        // Append the character at the random index to the result string
        result += characters[randomIndex];
    }

    return result;
}

function createItem() {
	return { [generateID()]: 'value' };
}

Tests:

concat
let params = new Array(1000).fill('a').map(createItem); let other = new Array(1000).fill('a').map(createItem).concat(params);
spread
let params = new Array(1000).fill('a').map(createItem); let other = [...new Array(1000).fill('a').map(createItem), ...params];
push (spread)
let params = new Array(1000).fill('a').map(createItem); let other = new Array(1000).fill('a').map(createItem); other.push(...params);
push (iterations)
let params = new Array(1000).fill('a').map(createItem); let other = new Array(1000).fill('a').map(createItem); params.forEach(it => other.push(it));

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
concat
spread
push (spread)
push (iterations)

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.4.1 Safari/605.1.15

Browser/OS: Safari 17 on Mac OS X 10.15.7

View result in a separate tab

spread

707/s

push (iterations)

706/s

push (spread)

695/s

concat

694/s

View exact numbers

Test name	Executions per second
✓ spread	707 Ops/sec
push (iterations)	706 Ops/sec
push (spread)	695 Ops/sec
concat	694 Ops/sec

concat vs spread vs push (version: 1)

Comparing performance of: `concat vs spread vs push (spread) vs push (iterations)`

Created: one year ago by: Guest

Go to the latest result

concat

spread

push (spread)

push (iterations)

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

concat vs spread vs push (version: 1)

Comparing performance of: concat vs spread vs push (spread) vs push (iterations)

Created: one year ago by: Guest

Go to the latest result

concat

spread

push (spread)

push (iterations)

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `concat vs spread vs push (spread) vs push (iterations)`