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function quickSort(arr) {
  if (arr.length < 2) return arr;

  const pivot = arr[~~(0 + Math.random() * arr.length)];

  return [
    ...quickSort(arr.filter(v => v < pivot)),
    ...arr.filter(v => v === pivot),
    ...quickSort(arr.filter(v => v > pivot)),
  ];

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// Class create
class Lazyman {
  constructor(name) {
    this.task = [];
    const fn = () => {
      console.log(`Hi! This is ${name}`);
      this.next();
    }
    this.task.push(fn);
    setTimeout(() => {

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// Extend copy
function extendCopy(o) {
  let c = {};

  for (let i in o) {
    c[i] = o[i];
  }

  c.uber = o;
  return c;

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// Use recursion
function flatten(arr) {
  let result = [];
  arr.forEach(el => {
    if (el instanceof Array) {
      result = result.concat(flatten(el));
    } else {
      result.push(el);
    }
  });

HuangXiZhou

class LruCache {
  constructor(maxsize) {
    this._cache = {}; // 缓存
    this._queue = []; // 队列
    this._maxsize = maxsize; // 最大值

    // 如果最大值输入非法 默认无限大
    if (!this._maxsize || !(typeof this._maxsize === 'number') || this._maxsize <= 0) {
      this._maxsize = Infinity;
    }

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#     _/_/_/_/  _/_/_/    _/_/_/
#    _/        _/    _/    _/
#   _/_/_/    _/_/_/      _/
#  _/        _/    _/    _/
# _/        _/_/_/    _/_/_/

_COLUMNS=$(tput cols)
_MESSAGE=" FBI Warining "
y=$((($_COLUMNS - ${#_MESSAGE}) / 2))
spaces=$(printf "%-${y}s" " ")

HuangXiZhou

.vuepress-plugin-demo-block__wrapper .vuepress-plugin-demo-block__footer:hover .vuepress-plugin-demo-block__expand::before,
.vuepress-plugin-demo-block__wrapper .vuepress-plugin-demo-block__footer:focus .vuepress-plugin-demo-block__expand::before,
.vuepress-plugin-demo-block__wrapper .vuepress-plugin-demo-block__footer:visited .vuepress-plugin-demo-block__expand::before {
  border-top-color: #2B66C4 !important;
  border-bottom-color: #2B66C4 !important;
}

.vuepress-plugin-demo-block__wrapper .vuepress-plugin-demo-block__footer .vuepress-plugin-demo-block__expand::before,
.vuepress-plugin-demo-block__wrapper .vuepress-plugin-demo-block__footer svg {
  transition: all .2s ease;

HuangXiZhou

function toUnderscore(string) {
  return string.toString().split(/(?=[A-Z])/).join('_').toLowerCase();
};

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