Run results for: test return object vs return array vs return seal object

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36

Browser: Chrome 92

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
returnObject	527758.4 Ops/sec
returnFrozenObject	475237.1 Ops/sec
returnSealedObject	465702.7 Ops/sec
returnCachedSealedObject	520699.3 Ops/sec
returnArray	515512.5 Ops/sec

Script Preparation code:

function returnObject() {
    return {
        a: parseInt(Math.random() * 32, 10),
        b: parseInt(Math.random() * 132, 10),
        c: parseInt(Math.random() * 232, 10),
        d: parseInt(Math.random() * 332, 10),
        e: parseInt(Math.random() * 432, 10),
    }
}

function returnSealedObject() {
    return Object.seal({
        a: parseInt(Math.random() * 32, 10),
        b: parseInt(Math.random() * 132, 10),
        c: parseInt(Math.random() * 232, 10),
        d: parseInt(Math.random() * 332, 10),
        e: parseInt(Math.random() * 432, 10),
    })
}

function returnFrozenObject() {
    return Object.freeze({
        a: parseInt(Math.random() * 32, 10),
        b: parseInt(Math.random() * 132, 10),
        c: parseInt(Math.random() * 232, 10),
        d: parseInt(Math.random() * 332, 10),
        e: parseInt(Math.random() * 432, 10),
    })
}

const objCache = Object.seal({
    a: 0,
    b: 0,
    c: 0,
    d: 0,
    e: 0,
})

function returnCachedSealedObject() {
    objCache.a = parseInt(Math.random() * 32, 10)
    objCache.b = parseInt(Math.random() * 132, 10)
    objCache.c = parseInt(Math.random() * 232, 10)
    objCache.d = parseInt(Math.random() * 332, 10)
    objCache.e = parseInt(Math.random() * 432, 10)
    return objCache
}


function returnArray() {
    return [
        parseInt(Math.random() * 32, 10),
        parseInt(Math.random() * 132, 10),
        parseInt(Math.random() * 232, 10),
        parseInt(Math.random() * 332, 10),
        parseInt(Math.random() * 432, 10),
    ]
}

Tests:

returnObject
returnObject()
returnFrozenObject
returnFrozenObject()
returnSealedObject
returnSealedObject()
returnCachedSealedObject
returnCachedSealedObject()
returnArray
returnArray()

Run results for: test return object vs return array vs return seal object

Test returning a plain object vs returning an array of items vs returning a sealed object vs returning a cached sealed object

returnObject

returnFrozenObject

returnSealedObject

returnCachedSealedObject

returnArray