| 'use strict'; |
| |
| const common = require('../common.js'); |
| |
| const bench = common.createBenchmark(main, { |
| method: ['for', 'for-of', 'for-in', 'forEach'], |
| count: [5, 10, 20, 100], |
| n: [5e6] |
| }); |
| |
| function useFor(n, items, count) { |
| bench.start(); |
| for (let i = 0; i < n; i++) { |
| for (let j = 0; j < count; j++) { |
| // eslint-disable-next-line no-unused-vars |
| const item = items[j]; |
| } |
| } |
| bench.end(n); |
| } |
| |
| function useForOf(n, items) { |
| bench.start(); |
| for (let i = 0; i < n; i++) { |
| // eslint-disable-next-line no-unused-vars |
| for (const item of items) {} |
| } |
| bench.end(n); |
| } |
| |
| function useForIn(n, items) { |
| bench.start(); |
| for (let i = 0; i < n; i++) { |
| for (const j in items) { |
| // eslint-disable-next-line no-unused-vars |
| const item = items[j]; |
| } |
| } |
| bench.end(n); |
| } |
| |
| function useForEach(n, items) { |
| bench.start(); |
| for (let i = 0; i < n; i++) { |
| items.forEach((item) => {}); |
| } |
| bench.end(n); |
| } |
| |
| function main({ n, count, method }) { |
| const items = new Array(count); |
| let fn; |
| for (let i = 0; i < count; i++) |
| items[i] = i; |
| |
| switch (method) { |
| case 'for': |
| fn = useFor; |
| break; |
| case 'for-of': |
| fn = useForOf; |
| break; |
| case 'for-in': |
| fn = useForIn; |
| break; |
| case 'forEach': |
| fn = useForEach; |
| break; |
| default: |
| throw new Error(`Unexpected method "${method}"`); |
| } |
| fn(n, items, count); |
| } |