Benchmark: Monomorphic vs Typed Monomorphic vs Empty Object prop assignment

Script Preparation code:

const source = {
    a: "",
    b: "",
    c: "",
    setA: function() {
        this.a = "";
    },
    setB: function() {
        this.b = "";
    },
    setC: function() {
        this.c = "";
    },
};

function assignProps1(target) {
    for (const key in source) {
        target[key] = source[key];
    }
};
function assignProps2(target) {
    for (const key in source) {
        target[key] = source[key];
    }
};
function assignProps3(target) {
    for (const key in source) {
        target[key] = source[key];
    }
};


const noop = function() {};

function getMonoData() {
    return {
        a: null,
        b: null,
        c: null,
        setA: null,
        setB: null,
        setC: null
    };
}

function getTypedData() {
    return {
        a: "",
        b: "",
        c: "",
        setA: noop,
        setB: noop,
        setC: noop
    };
}

function getEmptyData() {
    return {};
}

Tests:

Monomorphic
assignProps1(getMonoData());
Monomorphic Typed
assignProps2(getTypedData());
Empty Object
assignProps3(getEmptyData());

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Monomorphic
Monomorphic Typed
Empty Object

Fastest: N/A

Slowest: N/A

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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/537.36 (KHTML, like Gecko) Chrome/101.0.4951.64 Safari/537.36

Browser/OS: Chrome 101 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
Monomorphic	3194338.0 Ops/sec
Monomorphic Typed	3133326.0 Ops/sec
Empty Object	2785997.0 Ops/sec

Monomorphic vs Typed Monomorphic vs Empty Object prop assignment (version: 2)

Comparing performance of: Monomorphic vs Monomorphic Typed vs Empty Object

Created: one year ago by: Registered User

Jump to the latest result

Monomorphic

Monomorphic Typed

Empty Object

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A