zhongyangxun

function debounce(func, wait = 200, immediate) {
  let timeout = null;
  let context = null;
  let args = null;
  let previous = null;
  let result = null;

  function later() {
    var passed = Date.now() - previous;
    if (passed < wait) {

zhongyangxun

interface Computer {
  run: () => void;
}

class Windows implements Computer {
  run() {
    console.log('Windows')
  }
}

zhongyangxun

class Computer {
  constructor(mouse: string, keyboard: string, monitor: string) {}
}

class ComputerBuilder {
  mouse: string;
  keyboard: string;
  monitor: string;

  addMouse(mouse: string) {

zhongyangxun

const baiduMap = {
  show() {
    console.log('开始渲染百度地图。')
  }
}

const renderMap = (map) => {
  map.show()
}

zhongyangxun

const robot = {
  walk() {
    console.log('walk')
  }
}

robot.walk = (function() {
  const originWalk = robot.walk
  return function() {
    originWalk()

zhongyangxun

function heapSort(arr) {
  for (let i = (arr.length >> 1) - 1; i >= 0; i--) {
    adjust(arr, i, arr.length);
  }

  for (let j = arr.length - 1; j >= 0; j--) {
    swap(arr, 0, j);
    adjust(arr, 0, j);
  }

zhongyangxun

function quickSort(list) {
  return sortCore(list, 0, list.length - 1);
}

function sortCore(list, first, last) {
  if (last <= first) {
    return list;
  }
  const povitIndex = partition1(list, first, last);
  // const povitIndex = partition2(list, first, last);

zhongyangxun

function myInstanceOf(instance, constructor) {
  if (typeof constructor !== 'function') {
    throw Error(`The parameter 'constructor' is not a function!`)
  }

  let proto = instance.__proto__;
  const prototype = constructor.prototype;
  while (proto !== null) {
    if (prototype === proto) {
      return true;

zhongyangxun

const arr = [1, [2, [3], [4]]];
arr.flat(Infinity);

function _flat(arr) {
  return (
    Array.isArray(arr)
      ? arr.reduce((acc, cur) => [...acc, ..._flat(cur)], [])
      : [arr]
  )
}

zhongyangxun

function uniqueWithSet(arr) {
  return Array.from(new Set(arr));
}

function uniqueWithMap(arr) {
  const map = {};
  const res = [];
  for (item of arr) {
    // 主要为了区分数字与字符串，例如数字 1 和字符串 '1'
    const typeSign = typeof item;