host-check-startsWith-vs-NewURL.ts

const iterations = 1000000; // 試行回数
const urlString = "https://example.com/path/to/resource?query=param#fragment";
const domainToCheck = "https://example.com";

console.log(`Benchmarking with ${iterations} iterations...\n`);

// --- new URL() benchmark ---
console.log(`1. Parsing URL with new URL("${urlString}")`);
const startNewUrl = performance.now();
for (let i = 0; i < iterations; i++) {
  new URL(urlString);
}
const endNewUrl = performance.now();
const durationMsNewUrl = endNewUrl - startNewUrl;
const durationSecNewUrl = durationMsNewUrl / 1000;
const opsPerSecNewUrl = iterations / durationSecNewUrl;

console.log(
  `  Completed in ${durationMsNewUrl.toFixed(
    2
  )} ms (${durationSecNewUrl.toFixed(4)} seconds).`
);
console.log(`  Operations per second: ${opsPerSecNewUrl.toFixed(2)}\n`);

// --- startsWith() benchmark ---
console.log(`2. Checking domain with urlString.startsWith("${domainToCheck}")`);
const startStartsWith = performance.now();
for (let i = 0; i < iterations; i++) {
  urlString.startsWith(domainToCheck);
}
const endStartsWith = performance.now();
const durationMsStartsWith = endStartsWith - startStartsWith;
const durationSecStartsWith = durationMsStartsWith / 1000;
const opsPerSecStartsWith = iterations / durationSecStartsWith;

console.log(
  `  Completed in ${durationMsStartsWith.toFixed(
    2
  )} ms (${durationSecStartsWith.toFixed(4)} seconds).`
);
console.log(`  Operations per second: ${opsPerSecStartsWith.toFixed(2)}`);

Benchmarking with 1000000 iterations...

1. Parsing URL with new URL("https://example.com/path/to/resource?query=param#fragment")
  Completed in 191.30 ms (0.1913 seconds).
  Operations per second: 5227434.27

2. Checking domain with urlString.startsWith("https://example.com")
  Completed in 23.78 ms (0.0238 seconds).
  Operations per second: 42047476.65