Run results for: Pack array of bitmasks (numbers) to base64

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/134.0.0.0 Safari/537.36

Browser: Chrome 134

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Pack	1121335.1 Ops/sec
UnPack	2502285.0 Ops/sec

HTML Preparation code:

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

Script Preparation code:

function generateBitmasks() {
  const bitmasks = new Set();

  bitmasks.add(0);
  bitmasks.add(1);
  bitmasks.add(0xFF);       // 8 bits
  bitmasks.add(0xFFFF);     // 16 bits
  bitmasks.add(0xFFFFFF);   // 24 bits
  bitmasks.add(0xFFFFFFFF); // 32 bits

  for (let i = 0; i < 31; i++) {
    bitmasks.add(1 << i);
  }

  bitmasks.add(0x12345678);
  bitmasks.add(0x55555555);
  bitmasks.add(0xAAAAAAAA);
  bitmasks.add(0x33333333);
  bitmasks.add(0xCCCCCCCC);

  return Array.from(bitmasks)
}

var bitmasks = generateBitmasks();
var packed = packBitmasks(bitmasks);


function packBitmasks(bitmasks) {
  const buffer = new ArrayBuffer(bitmasks.length * 4);
  const uint32View = new Uint32Array(buffer);
  for (let i = 0; i < bitmasks.length; i++) {
    uint32View[i] = bitmasks[i];
  }
  const uint8View = new Uint8Array(buffer);
  const binary = String.fromCharCode.apply(null, uint8View);
  return btoa(binary);
}

function unpackBitmasks(packed) {
  const binary = atob(packed);
  const count = binary.length >>> 2;
  const result = new Array(count);
  for (let i = 0, offset = 0; i < count; i++, offset += 4) {
    result[i] =
      (
        binary.charCodeAt(offset) |
        (binary.charCodeAt(offset + 1) << 8) |
        (binary.charCodeAt(offset + 2) << 16) |
        (binary.charCodeAt(offset + 3) << 24)
      ) >>> 0;
  }
  return result;
}

Tests:

Pack
packBitmasks(bitmasks)
UnPack
unpackBitmasks(packed)

Run results for: Pack array of bitmasks (numbers) to base64

Pack

UnPack