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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 committed Feb 7, 2017
1 parent 9682151 commit 595df9fc4bb577b0f2a622cf23c1838445ef31f4
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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