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bench_number_conversion.js
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bench_number_conversion.js
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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 mixNumber(value) {
sink = (sink + (value * 1000003) | 0) ^ (sink << 5);
}
function mixString(value) {
sink = (sink + value.length * 33 + value.charCodeAt(value.length - 1)) | 0;
}
function bench(name, iterations, fn) {
const warmup = Math.max(1, iterations >> 4);
fn(warmup);
const start = now();
const ops = fn(iterations);
const elapsed = now() - start;
const nsPerOp = elapsed > 0 ? (elapsed * 1e6) / ops : 0;
const opsPerSec = elapsed > 0 ? (ops * 1000) / elapsed : 0;
console.log(
name +
": " +
elapsed.toFixed(2) +
"ms (" +
ops +
" ops, " +
nsPerOp.toFixed(2) +
" ns/op, " +
opsPerSec.toFixed(0) +
" ops/s)"
);
}
const decimalStrings = [
"0.7875",
"2.675",
"123456789.125",
"-0.0000033333333333333333",
"1.7976931348623157e308",
"5e-324",
" 42.5 ",
"0x10",
"0b101010",
"0o755",
];
const floatStrings = [
"0.7875px",
"2.675 and change",
" Infinity!",
"-0.0000033333333333333333ms",
"123456789.125;",
"5e-324end",
];
const literalSources = [
"0.7875",
"2.675",
"123456789.125",
"-0.0000033333333333333333",
"1.7976931348623157e308",
"5e-324",
"1_234_567.8_9",
"1.e+1",
];
const numbers = [
0.7875,
0.7876,
2.675,
123456789.125,
-0.0000033333333333333333,
1.7976931348623157e308,
5e-324,
Math.PI,
];
console.log("Number conversion benchmark (scale " + scale + ")");
bench("Number(string)", 500000 * scale, n => {
let sum = 0;
for (let i = 0; i < n; i++) {
sum += Number(decimalStrings[i % decimalStrings.length]);
}
mixNumber(sum);
return n;
});
bench("parseFloat(prefix)", 500000 * scale, n => {
let sum = 0;
for (let i = 0; i < n; i++) {
sum += parseFloat(floatStrings[i % floatStrings.length]);
}
mixNumber(sum);
return n;
});
bench("eval(decimal literal)", 60000 * scale, n => {
let sum = 0;
for (let i = 0; i < n; i++) {
sum += eval(literalSources[i % literalSources.length]);
}
mixNumber(sum);
return n;
});
bench("String(number)", 500000 * scale, n => {
for (let i = 0; i < n; i++) {
mixString(String(numbers[i & 7]));
}
return n;
});
bench("number.toFixed(20)", 250000 * scale, n => {
for (let i = 0; i < n; i++) {
mixString(numbers[i & 7].toFixed(20));
}
return n;
});
bench("number.toPrecision(17)", 250000 * scale, n => {
for (let i = 0; i < n; i++) {
mixString(numbers[i & 7].toPrecision(17));
}
return n;
});
bench("number.toExponential(20)", 250000 * scale, n => {
for (let i = 0; i < n; i++) {
mixString(numbers[i & 7].toExponential(20));
}
return n;
});
console.log("sink:", sink);

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bench_number_conversion.js (2 KB)

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