function generateRandomBitmasks(count = 100) {

    const bitmasks = new Array(count);

    for (let i = 0; i < count; i++) {

        let bitLength = Math.floor(Math.random() * (32 - 5 + 1)) + 5;

        bitmasks[i] = Math.floor(Math.random() * (1 << bitLength));

    }

    return bitmasks;

}

​

var bitmasks = generateRandomBitmasks();

var packed = packBitmasks(bitmasks);

var packedV8 = packBitmasksV8(bitmasks);

​

function packBitmasks(bitmasks) {

    let totalBits = bitmasks.length * 32;

    let packedSize = Math.ceil(totalBits / 8);

    let packed = new Uint8Array(packedSize);

    let bitIndex = 0;

​

    for (let i = 0; i < bitmasks.length; i++) {

        let value = bitmasks[i];

​

        for (let b = 0; b < 32; b++) {

            if (bitIndex >= totalBits) break;

            let bytePos = bitIndex >> 3;

            let bitPos = bitIndex % 8;

            if (value & (1 << b)) {

                packed[bytePos] |= (1 << bitPos);

            }

            bitIndex++;

        }

    }

​

    return packed;

}

​

function unpackBitmasks(packed, length) {

    let bitmasks = new Uint32Array(length);

    let bitIndex = 0;

​

    for (let i = 0; i < length; i++) {

        let value = 0;

        for (let b = 0; b < 32; b++) {

            if (bitIndex >= packed.length * 8) break;

            let bytePos = bitIndex >> 3;

            let bitPos = bitIndex % 8;

            if (packed[bytePos] & (1 << bitPos)) {

                value |= (1 << b);

            }

            bitIndex++;

        }

        bitmasks[i] = value;

    }

​

    return bitmasks;

}

​

function packBitmasksV8(bitmasks) {

    let packed = new Uint8Array(bitmasks.length * 4);

    let packedView = new Uint32Array(packed.buffer);

​

    for (let i = 0, len = bitmasks.length; i < len; i++) {

        packedView[i] = bitmasks[i];

    }

​

    return packed;

}

​

function unpackBitmasksV8(packed) {

    let packedView = new Uint32Array(packed.buffer);

    let bitmasks = new Array(packedView.length);

​

    for (let i = 0, len = packedView.length; i < len; i++) {

        bitmasks[i] = packedView[i];

    }

​

    return bitmasks;

}

​