Run results for: Dirty checks2

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 14_4_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.3 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 14

Operating system: iOS 14.4.2

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
checkDirtyNumber: match	7997645.0 Ops/sec
checkDirtyNumber: nomatch	7757116.0 Ops/sec
checkDirtyBigInt: match	1370325.6 Ops/sec
checkDirtyBigInt: nomatch	1337658.5 Ops/sec
checkDirtySet: match	6126014.5 Ops/sec
checkDirtySet: nomatch	3892348.8 Ops/sec

Script Preparation code:

const dirtyNumber = 0b101;
const dirtyBigInt = 0b101n;
const dirtySet = (new Set()).add(0).add(2);

function checkDirtyNumber(bits, offset) {
    return dirtyNumber & (bits << offset);
}

function checkDirtyBigInt(bits, offset) {
    return dirtyBigInt & (BigInt(bits) << BigInt(offset));
}

function checkDirtySet(index, offset) {
    return dirtySet.has(index + offset);
}

var base = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20];
var staged = Object.create(base);
staged[1] = 101;
staged[2] = 102;
staged[10] = 110;
staged[12] = 112;
staged[15] = 115;

function checkDirtyProto(ctx, index) {
  return ctx.hasOwnProperty(index); 
}

const hasOwnProperty = Object.prototype.hasOwnProperty;

function checkDirtyProto2(ctx, index) {
  return hasOwnProperty.call(ctx, index); 
}

Tests:

checkDirtyNumber: match
checkDirtyNumber(0b1, 0);
checkDirtyNumber: nomatch
checkDirtyNumber(0b10, 0);
checkDirtyBigInt: match
checkDirtyBigInt(0b1, 0);
checkDirtyBigInt: nomatch
checkDirtyBigInt(0b10, 0);
checkDirtySet: match
checkDirtySet(0, 0);
checkDirtySet: nomatch
checkDirtySet(1, 0);
checkDirtyProto: match
checkDirtyProto(staged, 10);
checkDirtyProto: nomatch
checkDirtyProto(staged, 19);
checkDirtyProto2: match
checkDirtyProto2(staged, 10);
checkDirtyProto2: nomatch
checkDirtyProto2(staged, 19);

Run results for: Dirty checks2

checkDirtyNumber: match

checkDirtyNumber: nomatch

checkDirtyBigInt: match

checkDirtyBigInt: nomatch

checkDirtySet: match

checkDirtySet: nomatch

checkDirtyProto: match

checkDirtyProto: nomatch

checkDirtyProto2: match

checkDirtyProto2: nomatch