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benchmarks: add spread operator benchmark

Useful for comparing spread operator performance over time.

PR-URL: #11227
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Brian White <mscdex@mscdex.net>
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jasnell authored and italoacasas committed Feb 7, 2017
1 parent a5e8176 commit 599c9472762433f4ee6a003aa7ee41dff172055c
Showing with 59 additions and 0 deletions.
  1. +59 −0 benchmark/es/spread-bench.js
@@ -0,0 +1,59 @@
+'use strict';
+
+const common = require('../common.js');
+const assert = require('assert');
+
+const bench = common.createBenchmark(main, {
+ method: ['apply', 'spread', 'call-spread'],
+ count: [5, 10, 20],
+ context: ['context', 'null'],
+ rest: [0, 1],
+ millions: [5]
+});
+
+function makeTest(count, rest) {
+ if (rest) {
+ return function test(...args) {
+ assert.strictEqual(count, args.length);
+ };
+ } else {
+ return function test() {
+ assert.strictEqual(count, arguments.length);
+ };
+ }
+}
+
+function main(conf) {
+ const n = +conf.millions * 1e6;
+ const ctx = conf.context === 'context' ? {} : null;
+ var fn = makeTest(conf.count, conf.rest);
+ const args = new Array(conf.count);
+ var i;
+ for (i = 0; i < conf.count; i++)
+ args[i] = i;
+
+ switch (conf.method) {
+ case 'apply':
+ bench.start();
+ for (i = 0; i < n; i++)
+ fn.apply(ctx, args);
+ bench.end(n / 1e6);
+ break;
+ case 'spread':
+ if (ctx !== null)
+ fn = fn.bind(ctx);
+ bench.start();
+ for (i = 0; i < n; i++)
+ fn(...args);
+ bench.end(n / 1e6);
+ break;
+ case 'call-spread':
+ bench.start();
+ for (i = 0; i < n; i++)
+ fn.call(ctx, ...args);
+ bench.end(n / 1e6);
+ break;
+ default:
+ throw new Error('Unexpected method');
+ }
+}

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