webpack优化篇（四十二）： 使用高版本的 webpack 和 Node.js

"use strict";
const runCount = 100;
const keyCount = 10000;
let map = new Map();
let keys = new Array(keyCount);
for (let i = 0; i < keyCount; i++) keys[i] = {};
for (let key of keys) map.set(key, true);
let startTime = process.hrtime();
for (let i = 0; i < runCount; i++) {
    for (let key of keys) {
        let value = map.get(key);
        if (value !== true) throw new Error(); 
    }
}
let elapsed = process.hrtime(startTime);
console.log(elapsed)
let [seconds, nanoseconds] = elapsed;
let milliseconds = Math.round(seconds * 1e3 + nanoseconds);
console.log(`${process.version} ${milliseconds} ms`);

const ARR_SIZE = 1000000;
const hugeArr = new Array(ARR_SIZE).fill(1);
// includes
const includesTest = () => {
    const arrCopy = [];
    console.time("includes");
    let i = 0
    while (i < hugeArr.length) {
        arrCopy.includes(i++)
    }
    console.timeEnd("includes");
}
// indexof
const indexOfTest = () => {
    const arrCopy = [];
    console.time("indexOf");
    let i = 0
    for (let item of hugeArr) {
        arrCopy.indexOf(item)
    }
    console.timeEnd("indexOf");
}
includesTest();
indexOfTest();