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'use strict'; const common = require('../common.js'); const assert = require('assert'); const bench = common.createBenchmark(main, { method: ['copy', 'rest', 'arguments'], n: [1e8] }); function copyArguments() { const len = arguments.length; const args = new Array(len); for (let 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(n) { for (let i = 0; i < n; i++) copyArguments(1, 2, 'a', 'b'); } function runRestArguments(n) { for (let i = 0; i < n; i++) restArguments(1, 2, 'a', 'b'); } function runUseArguments(n) { for (let i = 0; i < n; i++) useArguments(1, 2, 'a', 'b'); } function main({ n, method }) { let fn; switch (method) { 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(n); bench.end(n); }