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bench_string_builder.cjs
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bench_string_builder.cjs
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const now =
typeof performance !== "undefined" && performance && typeof performance.now === "function"
? () => performance.now()
: () => Date.now();
const scale =
typeof process !== "undefined" && process.argv && process.argv.length > 2
? Math.max(1, Number(process.argv[2]) || 1)
: 1;
let sink = 0;
function mixString(value) {
const len = value.length;
sink = (sink + len * 33 + (len ? value.charCodeAt(len - 1) : 0)) | 0;
}
function bench(name, iterations, fn) {
const warmup = Math.max(1, iterations >> 5);
for (let i = 0; i < warmup; i++) mixString(fn(i));
const start = now();
for (let i = 0; i < iterations; i++) mixString(fn(i));
const elapsed = now() - start;
const opsPerSec = elapsed > 0 ? (iterations * 1000) / elapsed : 0;
console.log(
name +
": " +
elapsed.toFixed(2) +
"ms (" +
iterations +
" ops, " +
opsPerSec.toFixed(0) +
" ops/s)"
);
}
function makeTemplateCase(count, literalSize) {
const data = {};
let template = "";
for (let i = 0; i < count; i++) {
const key = "p" + i;
data[key] = i % 3 === 0 ? "value" + i : i % 3 === 1 ? i : (i & 1) === 0;
template += "x".repeat(literalSize) + "{{" + key + "}}";
}
template += "tail";
return { template, data };
}
function makeRawCase(count, literalSize) {
const raw = [];
const args = [{ raw }];
for (let i = 0; i < count; i++) {
raw[i] = "r".repeat(literalSize);
if (i + 1 < count) args[i + 1] = i % 3 === 0 ? "sub" + i : i % 3 === 1 ? i : true;
}
return args;
}
const smallTemplate = "Hello {{name}} {{count}} {{ok}}.";
const smallTemplateData = { name: "Ant", count: 42, ok: true };
const largeTemplateCase = makeTemplateCase(96, 24);
const smallRawArgs = [{ raw: ["Hello ", " ", "."] }, "Ant", 42];
const largeRawArgs = makeRawCase(128, 24);
const objectToString = Object.prototype.toString;
const smallTagObject = { [Symbol.toStringTag]: "SmallTag" };
const largeTagObject = { [Symbol.toStringTag]: "T".repeat(800) };
const hugeLeft = "L".repeat(320 * 1024);
const hugeRight = "R".repeat(320 * 1024);
console.log("String builder bench scale=" + scale);
bench("String.prototype.template small/static", 250000 * scale, () => {
return smallTemplate.template(smallTemplateData);
});
bench("String.prototype.template large/spill", 25000 * scale, () => {
return largeTemplateCase.template.template(largeTemplateCase.data);
});
bench("String.raw small/static", 200000 * scale, () => {
return String.raw.apply(String, smallRawArgs);
});
bench("String.raw large/realloc", 20000 * scale, () => {
return String.raw.apply(String, largeRawArgs);
});
bench("Object.prototype.toString small/static", 300000 * scale, () => {
return objectToString.call(smallTagObject);
});
bench("Object.prototype.toString large/spill", 150000 * scale, () => {
return objectToString.call(largeTagObject);
});
bench("large binary concat flatten", 300 * scale, () => {
return hugeLeft + hugeRight;
});
console.log("sink=" + sink);

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bench_string_builder.cjs (2 KB)

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