benchmark: add text-encoder benchmark

benchmark/util/text-encoder.js

@@ -0,0 +1,31 @@
+'use strict';
+
+const common = require('../common.js');
+
+const BASE = 'string\ud801';
+
+const bench = common.createBenchmark(main, {
+  n: [1e4],
+  op: ['encode', 'encodeInto']
+});
+
+function main({ n, ignoreBOM, op }) {
+  const encoder = new TextEncoder();
+  const input = BASE.repeat(n);
+  const subarray = new Uint8Array(n);
+
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    switch (op) {
+      case 'encode': {
+        encoder.encode(input);
+        break;
+      }
+      case 'encodeInto': {
+        encoder.encodeInto(input, subarray);
+        break;
+      }
+    }
+  }
+  bench.end(n);
+}