DefectingCat

let x = 2;
Number.prototype.valueOf = function () {
  return x++;
};
const a = new Number(2);

console.log(a == 2 && a == 3 && a == 4);

DefectingCat

const arr = [1, 2, 3, 'x', 'f', 'y'];

// for (const i of arr) {
//   console.log(i);
// }

const it = arr[Symbol.iterator]();

for (let res; (res = it.next()) && !res.done; ) {
  console.log(res.value);

DefectingCat

const isWeChat = () => /MicroMessenger/i.test(window.navigator.userAgent);

DefectingCat

let arr = [
  { name: 'zs', age: 15, happy: ['唱歌', '玩游戏'] },
  { name: 'ls', age: 15, happy: ['玩游戏'] },
  { name: 'zs', age: 15, happy: ['学习', '划水'] },
];

function test(arr) {
  let _obj = {};
  let _arr = [];
  if (!arr.length) return;

DefectingCat

// "typescript": "~4.1.5"
type Debounce = {
  <T extends unknown[]>(fn: (...arg: T) => void | unknown, ms: number): (
    this: unknown,
    ...arg: T
  ) => void | unknown;
};

/**
 * debounce function wrapper

DefectingCat

class ParentA {
  constructor() {
    this.id = 'a';
  }
  foo() {
    console.log('Parent A: ', this.id);
  }
}

class ParentB {

DefectingCat

function* fibonacciSquence() {
  let x = 0,
    y = 1;
  for (;;) {
    yield y;
    [x, y] = [y, x + y];
  }
}

const fibonacci = (n: number) => {

DefectingCat

function fibonacci(num) {
    let count = 0;
    let result = [1, 1];
    if (num <= 1) {
        return result;
    }
    let n = num - 2;
    for (let i = 0; i < n; i++) {
        result.push(result[count] + result[count + 1]);
        count++;

DefectingCat

let xfy = (() => {
    let name = 'xfy';
    let age = 18;
    let obj = {};
    Object.defineProperty(obj, 'test', {
        get: function () {
            return name + ' : ' + age;
        },
        set: function (value) {
            name = value;

DefectingCat

let obj = {
    a: "xfy",
    b: {
        c: "test",
    },
    d: 123,
    e: [1, 2, 3, 4, 5],
    f: {
        g: 'array',
        h: [1, 2, 3, 4, 5, 6, {