Create byteLength.mjs

bench/snippets/byteLength.mjs

@@ -0,0 +1,27 @@
+import { Buffer } from "node:buffer";
+import { bench, run } from "../runner.mjs";
+
+const variations = [
+  ["latin1", "hello world"],
+  ["utf16", "hello emoji 🤔"],
+];
+
+for (const [label, string] of variations) {
+  const big = Buffer.alloc(1000000, string).toString();
+  const small = Buffer.from(string).toString();
+  const substring = big.slice(0, big.length - 2);
+
+  bench(`${substring.length}`, () => {
+    return Buffer.byteLength(substring, "utf8");
+  });
+
+  bench(`${small.length}`, () => {
+    return Buffer.byteLength(small);
+  });
+
+  bench(`${big.length}`, () => {
+    return Buffer.byteLength(big);
+  });
+}
+
+await run();