From 6116c39b162fdca082e841bd96da24712707fd88 Mon Sep 17 00:00:00 2001
From: Timothy Gu <timothygu99@gmail.com>
Date: Thu, 28 Sep 2017 11:32:47 -0700
Subject: [PATCH] benchmark: add util/type-check

---
 benchmark/util/type-check.js | 50 ++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 benchmark/util/type-check.js

diff --git a/benchmark/util/type-check.js b/benchmark/util/type-check.js
new file mode 100644
index 00000000000000..1d9a4f30ef0a9c
--- /dev/null
+++ b/benchmark/util/type-check.js
@@ -0,0 +1,50 @@
+'use strict';
+
+const common = require('../common');
+
+const arrayBuffer = new ArrayBuffer();
+const dataView = new DataView(arrayBuffer);
+const uint8Array = new Uint8Array(arrayBuffer);
+const int32Array = new Int32Array(arrayBuffer);
+
+const args = {
+  ArrayBufferView: {
+    'true': dataView,
+    'false-primitive': true,
+    'false-object': arrayBuffer
+  },
+  TypedArray: {
+    'true': int32Array,
+    'false-primitive': true,
+    'false-object': arrayBuffer
+  },
+  Uint8Array: {
+    'true': uint8Array,
+    'false-primitive': true,
+    'false-object': int32Array
+  }
+};
+
+const bench = common.createBenchmark(main, {
+  type: Object.keys(args),
+  version: ['native', 'js'],
+  argument: ['true', 'false-primitive', 'false-object'],
+  millions: ['5']
+}, {
+  flags: ['--expose-internals']
+});
+
+function main(conf) {
+  const util = process.binding('util');
+  const types = require('internal/util/types');
+
+  const n = (+conf.millions * 1e6) | 0;
+  const func = { native: util, js: types }[conf.version][`is${conf.type}`];
+  const arg = args[conf.type][conf.argument];
+
+  bench.start();
+  for (var i = 0; i < n; i++) {
+    func(arg);
+  }
+  bench.end(n);
+}