Run results for: json vs arraybuffer

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 17_6_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/17.6 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 17

Operating system: iOS 17.6.1

Device Platform: Mobile

Date tested: 25 days ago

Test name	Executions per second
arraybuffer	53362.8 Ops/sec
json	2371188.8 Ops/sec

HTML Preparation code:

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

Script Preparation code:

function serializeToArrayBuffer(obj) {
    const encoder = new TextEncoder();
    let bufferArray = [];

    function serialize(value) {
        if (typeof value === "string") {
            bufferArray.push(1); // Type marker for string
            const encoded = encoder.encode(value);
            bufferArray.push(...new Uint8Array(new Uint32Array([encoded.length]).buffer));
            bufferArray.push(...encoded);
        } else if (typeof value === "number") {
            bufferArray.push(2); // Type marker for number
            bufferArray.push(...new Uint8Array(new Float64Array([value]).buffer));
        } else if (typeof value === "boolean") {
            bufferArray.push(3); // Type marker for boolean
            bufferArray.push(value ? 1 : 0);
        } else if (Array.isArray(value)) {
            bufferArray.push(4); // Type marker for array
            bufferArray.push(...new Uint8Array(new Uint32Array([value.length]).buffer));
            value.forEach((item) => serialize(item));
        } else if (value && typeof value === "object") {
            bufferArray.push(5); // Type marker for object
            const keys = Object.keys(value);
            bufferArray.push(...new Uint8Array(new Uint32Array([keys.length]).buffer));
            keys.forEach((key) => {
                serialize(key); // Serialize key as string
                serialize(value[key]); // Serialize value
            });
        } else if (value === null) {
            bufferArray.push(6); // Type marker for null
        }
    }

    serialize(obj);
    return new Uint8Array(bufferArray).buffer;
}

function deserializeFromArrayBuffer(buffer) {
    const decoder = new TextDecoder();
    const uint8Array = new Uint8Array(buffer);
    let offset = 0;

    function deserialize() {
        const type = uint8Array[offset++];
        if (type === 1) {
            // String
            const length = new Uint32Array(uint8Array.buffer.slice(offset, offset + 4))[0];
            offset += 4;
            const str = decoder.decode(uint8Array.slice(offset, offset + length));
            offset += length;
            return str;
        } else if (type === 2) {
            // Number
            const num = new Float64Array(uint8Array.buffer.slice(offset, offset + 8))[0];
            offset += 8;
            return num;
        } else if (type === 3) {
            // Boolean
            return uint8Array[offset++] === 1;
        } else if (type === 4) {
            // Array
            const length = new Uint32Array(uint8Array.buffer.slice(offset, offset + 4))[0];
            offset += 4;
            const arr = [];
            for (let i = 0; i < length; i++) {
                arr.push(deserialize());
            }
            return arr;
        } else if (type === 5) {
            // Object
            const length = new Uint32Array(uint8Array.buffer.slice(offset, offset + 4))[0];
            offset += 4;
            const obj = {};
            for (let i = 0; i < length; i++) {
                const key = deserialize(); // Deserialize key (string)
                const value = deserialize(); // Deserialize value
                obj[key] = value;
            }
            return obj;
        } else if (type === 6) {
            // Null
            return null;
        } else {
            throw new Error("Unknown type marker: " + type);
        }
    }

    return deserialize();
}

const test = {
    a: "hohojoho",
    b: { c: [1, "string", { nested: true }, null] },
    d: 1,
    e: true,
    f: null,
};

Tests:

arraybuffer
const buffer = serializeToArrayBuffer(test); const result = deserializeFromArrayBuffer(buffer);
json
const jsonStr = JSON.stringify(test); const result = JSON.parse(jsonStr);