'use strict'; const common = require('../common.js'); const assert = require('assert'); const bench = common.createBenchmark(main, { method: ['copy', 'rest', 'arguments'], millions: [100] }); function copyArguments() { const len = arguments.length; const args = new Array(len); for (var i = 0; i < len; i++) args[i] = arguments[i]; assert.strictEqual(args[0], 1); assert.strictEqual(args[1], 2); assert.strictEqual(args[2], 'a'); assert.strictEqual(args[3], 'b'); } function restArguments(...args) { assert.strictEqual(args[0], 1); assert.strictEqual(args[1], 2); assert.strictEqual(args[2], 'a'); assert.strictEqual(args[3], 'b'); } function useArguments() { assert.strictEqual(arguments[0], 1); assert.strictEqual(arguments[1], 2); assert.strictEqual(arguments[2], 'a'); assert.strictEqual(arguments[3], 'b'); } function runCopyArguments(millions) { for (var i = 0; i < millions * 1e6; i++) copyArguments(1, 2, 'a', 'b'); } function runRestArguments(millions) { for (var i = 0; i < millions * 1e6; i++) restArguments(1, 2, 'a', 'b'); } function runUseArguments(millions) { for (var i = 0; i < millions * 1e6; i++) useArguments(1, 2, 'a', 'b'); } function main({ millions, method }) { var fn; switch (method) { case '': // Empty string falls through to next line as default, mostly for tests. case 'copy': fn = runCopyArguments; break; case 'rest': fn = runRestArguments; break; case 'arguments': fn = runUseArguments; break; default: throw new Error(`Unexpected method "${method}"`); } bench.start(); fn(millions); bench.end(millions); }