benchmark: obj property access benchmark

Benchmark that compares the obj property access patterns being used in core today. Specifically comparing the two patterns: ```js function A() {}; function B() {}; var obj = {A, B, C: 1}; ``` and ```js function A() {} function B() {} var obj = {}; obj.A = A; obj.B = B; obj.C = 1; ```
nodejs · jasnell · Feb 28, 2017 · Feb 28, 2017 · 22450b5f28770ee330b019fd92b63cda5dedd3f2 · mscdex
commit 22450b5f28770ee330b019fd92b63cda5dedd3f2
diff --git a/benchmark/es/obj-bench.js b/benchmark/es/obj-bench.js
@@ -0,0 +1,53 @@
+'use strict';
+
+const common = require('../common.js');
+const Obj1 = require('../fixtures/moduleA');
+const Obj2 = require('../fixtures/moduleB');
+
+const bench = common.createBenchmark(main, {
+  // TODO(jasnell): A and B are not great labels, not sure what would be better
+  method: ['A', 'B'],
+  access: ['direct', 'indirect'],
+  millions: [10]
+});
+
+function run(n, obj, direct) {
+  var i;
+  if (direct) {
+    bench.start();
+    for (i = 0; i < n; i++) {
+      obj.A();
+      obj.B();
+      obj.C;
+    }
+    bench.end(n / 1e6);
+  } else {
+    const A = obj.A;
+    const B = obj.B;
+    bench.start();
+    for (i = 0; i < n; i++) {
+      A();
+      B();
+      obj.C;
+    }
+    bench.end(n / 1e6);
+  }
+}
+
+function main(conf) {
+  const n = +conf.millions * 1e6;
+  const direct = conf.access === 'direct';
+
+  switch (conf.method) {
+    case 'A':
+      // Uses the {A, B, C: 1}; Syntax
+      run(n, Obj1, direct);
+      break;
+    case 'B':
+      // Uses the obj = {}; obj.A = A; obj.B = B; obj.C = 1; Syntax
+      run(n, Obj2, direct);
+      break;
+    default:
+      throw new Error('Unexpected type');
+  }
+}
diff --git a/benchmark/fixtures/moduleA.js b/benchmark/fixtures/moduleA.js
@@ -0,0 +1,11 @@
+'use strict';
+
+function A() {}
+
+function B() {}
+
+module.exports = {
+  A,
+  B,
+  C: 1
+};
diff --git a/benchmark/fixtures/moduleB.js b/benchmark/fixtures/moduleB.js
@@ -0,0 +1,7 @@
+'use strict';
+
+exports.A = function() {};
+
+exports.B = function() {};
+
+exports.C = 1;