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bench_includes_breakdown.cjs
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bench_includes_breakdown.cjs
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function runBench(label, iterations, fn, options) {
const warmup = options && options.warmup ? options.warmup : 5;
const samples = options && options.samples ? options.samples : 10;
for (let i = 0; i < warmup; i++) fn();
let min = Infinity;
let max = -Infinity;
let total = 0;
let last = 0;
for (let i = 0; i < samples; i++) {
const start = performance.now();
last = fn();
const elapsed = performance.now() - start;
if (elapsed < min) min = elapsed;
if (elapsed > max) max = elapsed;
total += elapsed;
}
const mean = total / samples;
const opsPerMs = iterations / mean;
console.log(label);
console.log(` iterations: ${iterations}`);
console.log(` result: ${last}`);
console.log(` mean: ${mean.toFixed(3)} ms`);
console.log(` min: ${min.toFixed(3)} ms`);
console.log(` max: ${max.toFixed(3)} ms`);
console.log(` ops/ms: ${opsPerMs.toFixed(1)}`);
}
const dense = [];
for (let i = 0; i < 1024; i++) dense.push(i);
const sparse = Array(1024);
const genericOwn = {
get length() {
return 1024;
},
get 1023() {
return 1;
}
};
const genericProtoBase = { 1023: 1 };
const genericProto = Object.create(genericProtoBase);
Object.defineProperty(genericProto, "length", {
configurable: true,
enumerable: true,
get() {
return 1024;
}
});
const proxy = new Proxy(
{ length: 4, 0: NaN, 1: 0, 2: NaN, 3: 1 },
{
get(target, key) {
return target[key];
}
}
);
const typed = new Uint32Array(1024);
typed[1023] = 1;
runBench("dense hit tail", 20000, () => {
let hits = 0;
for (let r = 0; r < 20000; r++) {
if (dense.includes(1023)) hits++;
}
return hits;
});
runBench("dense miss", 20000, () => {
let hits = 0;
for (let r = 0; r < 20000; r++) {
if (dense.includes(-1)) hits++;
}
return hits;
});
runBench("dense hit negative fromIndex", 20000, () => {
let hits = 0;
for (let r = 0; r < 20000; r++) {
if (dense.includes(1023, -1)) hits++;
}
return hits;
});
runBench("sparse includes(undefined)", 50000, () => {
let hits = 0;
for (let r = 0; r < 50000; r++) {
if (sparse.includes(undefined)) hits++;
}
return hits;
});
runBench("sparse miss non-undefined", 50000, () => {
let hits = 0;
for (let r = 0; r < 50000; r++) {
if (sparse.includes(1)) hits++;
}
return hits;
});
runBench("generic own getter", 20000, () => {
let hits = 0;
for (let r = 0; r < 20000; r++) {
if ([].includes.call(genericOwn, 1, 1023)) hits++;
}
return hits;
});
runBench("generic inherited value", 20000, () => {
let hits = 0;
for (let r = 0; r < 20000; r++) {
if ([].includes.call(genericProto, 1, 1023)) hits++;
}
return hits;
});
runBench("proxy NaN fromIndex", 20000, () => {
let hits = 0;
for (let r = 0; r < 20000; r++) {
if (Array.prototype.includes.call(proxy, NaN, 1)) hits++;
}
return hits;
});
runBench("typedarray hit", 50000, () => {
let hits = 0;
for (let r = 0; r < 50000; r++) {
if (typed.includes(1)) hits++;
}
return hits;
});
runBench("typedarray miss", 50000, () => {
let hits = 0;
for (let r = 0; r < 50000; r++) {
if (typed.includes(2)) hits++;
}
return hits;
});

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