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这些JavaScript编程黑科技，装逼指南，高逼格代码，让你惊叹不已 #24

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这些JavaScript编程黑科技，装逼指南，高逼格代码，让你惊叹不已#24
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JS玄学
@jawil

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@jawil
jawil
opened on Aug 20, 2017 · edited by jawil
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Javascript是一门很吊的语言，我可能学了假的JavaScript，哈哈，大家还有什么推荐的，补充送那啥邀请码。

本文秉承着：你看不懂是你SB，我写的代码就要牛逼。

1、单行写一个评级组件

"★★★★★☆☆☆☆☆".slice(5 - rate, 10 - rate);定义一个变量rate是1到5的值，然后执行上面代码，看图

才发现插件什么的都弱爆了


来源：来自知乎用户蜗牛老湿的回答

2、如何装逼用代码骂别人SB

(!(~+[])+{})[--[~+""][+[]]*[~+[]] + ~~!+[]]+({}+[])[[~!+[]]*~+[]]



了解为什么请移步：一行能装逼的JavaScript代码

3、如何用代码优雅的证明自己NB

这个牛逼了

	console.log(([][[]]+[])[+!![]]+([]+{})[!+[]+!![]])

4、JavaScript 错误处理的方式的正确姿势

😂😂😂，舅服你

try {
    something
} catch (e) {
    window.location.href =
        "http://stackoverflow.com/search?q=[js]+" +
        e.message;
}

5、从一行代码里面学点JavaScript

[].forEach.call($$("*"),function(a){
    a.style.outline="1px solid #"+(~~(Math.random()*(1<<24))).toString(16)
})

翻译成正常语言就是这样的

Array.prototype.forEach.call(document.querySelectorAll('*'), 
dom => dom.style.outline = `1px solid #${parseInt(Math.random() * 
Math.pow(2,24)).toString(16)}`)

接下来在浏览器控制看看：something magic happens



具体分析请参见这篇文章：从一行代码里面学点JavaScript

6、论如何优雅的取随机字符串

Math.random().toString(16).substring(2) 
Math.random().toString(36).substring(2)

7、(10)["toString"]() === "10"


解析请移步：js奇淫技巧1

8、匿名函数自执行

这么多写法你选择哪一种？我选择死亡。

( function() {}() );
( function() {} )();
[ function() {}() ];

~ function() {}();
! function() {}();
+ function() {}();
- function() {}();

delete function() {}();
typeof function() {}();
void function() {}();
new function() {}();
new function() {};

var f = function() {}();

1, function() {}();
1 ^ function() {}();
1 > function() {}();
// ...

9、另外一种undefined

从来不需要声明一个变量的值是undefined，因为JavaScript会自动把一个未赋值的变量置为undefined。所有如果你在代码里这么写，会被鄙视的

var data = undefined;

但是如果你就是强迫症发作，一定要再声明一个暂时没有值的变量的时候赋上一个undefined。那你可以考虑这么做：

 var data = void 0; // undefined

void在JavaScript中是一个操作符，对传入的操作不执行并且返回undefined。void后面可以跟()来用，例如void(0)，看起来是不是很熟悉？没错，在HTML里阻止带href的默认点击操作时，都喜欢把href写成javascript:void(0)，实际上也是依靠void操作不执行的意思。

当然，除了出于装逼的原因外，实际用途上不太赞成使用void，因为void的出现是为了兼容早起ECMAScript标准中没有undefined属性。void 0的写法让代码晦涩难懂。

10、论如何优雅的取整

var a = ~~2.33

var b= 2.33 | 0

var c= 2.33 >> 0

11、如何优雅的实现金钱格式化：1234567890 --> 1,234,567,890

用正则魔法实现：

var test1 = '1234567890'
var format = test1.replace(/\B(?=(\d{3})+(?!\d))/g, ',')

console.log(format) // 1,234,567,890

非正则的优雅实现：

 function formatCash(str) {
       return str.split('').reverse().reduce((prev, next, index) => {
            return ((index % 3) ? next : (next + ',')) + prev
       })
}
console.log(formatCash('1234567890')) // 1,234,567,890

12、这个我服，还有这个你很机智

我服

while (1) {
    alert('牛逼你把我关了啊')
}

你很机智，好一个障眼法

清除缓存： <a href="javascript:alert('清除成功');">清除缓存</a>

13、逗号运算符

var a = 0; 
var b = ( a++, 99 ); 
console.log(a);  // 1
console.log(b);  // 99

14、论如何最佳的让两个整数交换数值

常规办法：

var a=1,b=2;
a += b;
b = a - b;
a -= b;

缺点也很明显，整型数据溢出，对于32位字符最大表示数字是2147483647，如果是2147483645和2147483646交换就失败了。
黑科技办法：

a ^= b;
b ^= a;
a ^= b;

哈哈😄，看不懂的童鞋建议去补习一下C语言的位操作，我就不去复习了，以前学嵌入式时候学的位操作都忘了

15、实现标准JSON的深拷贝

var a = {
    a: 1,
    b: { c: 1, d: 2 }
}
var b=JSON.parse(JSON.stringify(a))

不考虑IE的情况下，标准JSON格式的对象蛮实用，不过对于undefined和function的会忽略掉。

16、不用Number、parseInt和parseFloat和方法把"1"字符串转换成数字

哈哈，不准用强制类型转换，那么就想到了强大了隐式转换

var a =1 
+a

17、如何装逼的写出"hello world!"

滚动条很长哦😯

([]+[][(![]+[])[!+[]+!![]+!![]]+([]+{})[+!![]]+(!![]+[])[+!![]]+(!![]+[])[+[]]][([]+{})[!+[]+!![]+!![]+!![]+!![]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([][[]]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]+!![]+!![]]+(![]+[])[!+[]+!![]]+([]+{})[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(+{}+[])[+!![]]+(!![]+[])[+[]]+([][[]]+[])[!+[]+!![]+!![]+!![]+!![]]+([]+{})[+!![]]+([][[]]+[])[+!![]])())[+[]]+([][[]]+[])[!+[]+!![]+!![]]+(![]+[])[!+[]+!![]]+(![]+[])[!+[]+!![]]+([]+{})[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]+!![]+!![]]+[][(![]+[])[!+[]+!![]+!![]]+([]+{})[+!![]]+(!![]+[])[+!![]]+(!![]+[])[+[]]][([]+{})[!+[]+!![]+!![]+!![]+!![]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([][[]]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]+!![]+!![]]+([][[]]+[])[+[]]+([][[]]+[])[+!![]]+([][[]]+[])[!+[]+!![]+!![]]+(![]+[])[!+[]+!![]+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(+{}+[])[+!![]]+([]+[][(![]+[])[!+[]+!![]+!![]]+([]+{})[+!![]]+(!![]+[])[+!![]]+(!![]+[])[+[]]][([]+{})[!+[]+!![]+!![]+!![]+!![]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([][[]]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]+!![]+!![]]+(![]+[])[!+[]+!![]]+([]+{})[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(+{}+[])[+!![]]+(!![]+[])[+[]]+([][[]]+[])[!+[]+!![]+!![]+!![]+!![]]+([]+{})[+!![]]+([][[]]+[])[+!![]])())[!+[]+!![]+!![]]+([][[]]+[])[!+[]+!![]+!![]])()([][(![]+[])[!+[]+!![]+!![]]+([]+{})[+!![]]+(!![]+[])[+!![]]+(!![]+[])[+[]]][([]+{})[!+[]+!![]+!![]+!![]+!![]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([][[]]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]+!![]+!![]]+([][[]]+[])[!+[]+!![]+!![]]+(![]+[])[!+[]+!![]+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(+{}+[])[+!![]]+([]+[][(![]+[])[!+[]+!![]+!![]]+([]+{})[+!![]]+(!![]+[])[+!![]]+(!![]+[])[+[]]][([]+{})[!+[]+!![]+!![]+!![]+!![]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([][[]]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]+!![]+!![]]+(![]+[])[!+[]+!![]]+([]+{})[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(+{}+[])[+!![]]+(!![]+[])[+[]]+([][[]]+[])[!+[]+!![]+!![]+!![]+!![]]+([]+{})[+!![]]+([][[]]+[])[+!![]])())[!+[]+!![]+!![]]+([][[]]+[])[!+[]+!![]+!![]])()(([]+{})[+[]])[+[]]+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+[])+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+[]))+([]+{})[+!![]]+(!![]+[])[+!![]]+(![]+[])[!+[]+!![]]+([][[]]+[])[!+[]+!![]]+[][(![]+[])[!+[]+!![]+!![]]+([]+{})[+!![]]+(!![]+[])[+!![]]+(!![]+[])[+[]]][([]+{})[!+[]+!![]+!![]+!![]+!![]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([][[]]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]+!![]+!![]]+([][[]]+[])[+[]]+([][[]]+[])[+!![]]+([][[]]+[])[!+[]+!![]+!![]]+(![]+[])[!+[]+!![]+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(+{}+[])[+!![]]+([]+[][(![]+[])[!+[]+!![]+!![]]+([]+{})[+!![]]+(!![]+[])[+!![]]+(!![]+[])[+[]]][([]+{})[!+[]+!![]+!![]+!![]+!![]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([][[]]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]+!![]+!![]]+(![]+[])[!+[]+!![]]+([]+{})[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(+{}+[])[+!![]]+(!![]+[])[+[]]+([][[]]+[])[!+[]+!![]+!![]+!![]+!![]]+([]+{})[+!![]]+([][[]]+[])[+!![]])())[!+[]+!![]+!![]]+([][[]]+[])[!+[]+!![]+!![]])()([][(![]+[])[!+[]+!![]+!![]]+([]+{})[+!![]]+(!![]+[])[+!![]]+(!![]+[])[+[]]][([]+{})[!+[]+!![]+!![]+!![]+!![]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([][[]]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]+!![]+!![]]+([][[]]+[])[!+[]+!![]+!![]]+(![]+[])[!+[]+!![]+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(+{}+[])[+!![]]+([]+[][(![]+[])[!+[]+!![]+!![]]+([]+{})[+!![]]+(!![]+[])[+!![]]+(!![]+[])[+[]]][([]+{})[!+[]+!![]+!![]+!![]+!![]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([][[]]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]+!![]+!![]]+(![]+[])[!+[]+!![]]+([]+{})[+!![]]+([]+{})[!+[]+!![]+!![]+!![]+!![]]+(+{}+[])[+!![]]+(!![]+[])[+[]]+([][[]]+[])[!+[]+!![]+!![]+!![]+!![]]+([]+{})[+!![]]+([][[]]+[])[+!![]])())[!+[]+!![]+!![]]+([][[]]+[])[!+[]+!![]+!![]])()(([]+{})[+[]])[+[]]+(!+[]+!![]+[])+(+!![]+[]))

居然能运行，牛逼的隐式转换

18、parseInt(0.0000008) === 8

19、++[[]][+[]]+[+[]] == 10

强大的隐式转换，23333

20、0.1 + 0.2 == 0.3

0.1 +0.2 == 0.3 竟然是不成立的。。。。所以这就是为什么数据库存储对于货币的最小单位都是分。

简单说，0.1和0.2的二进制浮点表示都不是精确的，所以相加后不是0.3，接近（不等于）
0.30000000000000004。

所以，比较数字时，应该有个宽容值。ES6中这个宽容值被预定义了：Number.EPSILON。

21、最短的代码实现数组去重

[...new Set([1, "1", 2, 1, 1, 3])]

前不久面试阿里就问了这道题，哈哈，所以也写上一下

22、用最短的代码实现一个长度为m(6)且值都n(8)的数组

Array(6).fill(8)

这个够短了吧，好像是当初哪里看到的一个面试题，就自己想到了ES6的一些API

23、短路表达式

条件判断

var a = b && 1
    // 相当于
if (b) {
    a = 1
} else {
    a = b
}

var a = b || 1
    // 相当于
if (b) {
    a = b
} else {
    a = 1
}

24、JavaScript版迷宫


逃出迷宫，2333

25、取出一个数组中的最大值和最小值

var numbers = [5, 458 , 120 , -215 , 228 , 400 , 122205, -85411]; 
var maxInNumbers = Math.max.apply(Math, numbers); 
var minInNumbers = Math.min.apply(Math, numbers);

26、将argruments对象转换成数组

var argArray = Array.prototype.slice.call(arguments);

或者ES6：

var argArray = Array.from(arguments)

27、javascript高逼格之Function构造函数

很多JavaScript教程都告诉我们，不要直接用内置对象的构造函数来创建基本变量，例如var arr = new Array(2); 的写法就应该用var arr = [1, 2];的写法来取代。

但是，Function构造函数（注意是大写的Function）有点特别。Function构造函数接受的参数中，第一个是要传入的参数名，第二个是函数内的代码（用字符串来表示）。

var f = new Function('a', 'alert(a)');
f('jawil'); // 将会弹出窗口显示jawil

这种方式可以根据传入字符串内容来创建一个函数 是不是高大上？！

28、从一个数组中找到一个数，O(n)的算法，找不到就返回 null。

正常的版本:

function find (x, y) {
  for ( let i = 0; i < x.length; i++ ) {
    if ( x[i] == y ) return i;
  }
  return null;
}
 
let arr = [0,1,2,3,4,5]
console.log(find(arr, 2))
console.log(find(arr, 8))

结果到了函数式成了下面这个样子（好像上面的那些代码在下面若影若现，不过又有点不太一样，为了消掉if语言，让其看上去更像一个表达式，动用了 ? 号表达式）：

//函数式的版本
const find = ( f => f(f) ) ( f =>
  (next => (x, y, i = 0) =>
    ( i >= x.length) ?  null :
      ( x[i] == y ) ? i :
        next(x, y, i+1))((...args) =>
          (f(f))(...args)))
 
let arr = [0,1,2,3,4,5]
console.log(find(arr, 2))
console.log(find(arr, 8))

如何读懂并写出装逼的函数式代码

最后奉劝大家一句：莫装逼、白了少年头，2333。。。原文收录在我的 GitHub博客 (https://github.com/jawil/blog) ，喜欢的可以关注最新动态，大家一起多交流学习，共同进步，以学习者的身份写博客，记录点滴。

Activity

jawil
added
JS
玄学
on Aug 20, 2017
GreatAuk

GreatAuk commented on Aug 20, 2017

@GreatAuk
GreatAuk
on Aug 20, 2017

知乎上的？

shendengnian

shendengnian commented on Aug 20, 2017

@shendengnian
shendengnian
on Aug 20, 2017

我是沙发

jawil

jawil commented on Aug 20, 2017

@jawil
jawil
on Aug 20, 2017
OwnerAuthor

Quora上的？ @GreatAuk

muzea

muzea commented on Aug 20, 2017

@muzea
muzea
on Aug 20, 2017

格式化钱那个为啥不用 toLocaleString ？

jawil

jawil commented on Aug 20, 2017

@jawil
jawil
on Aug 20, 2017
OwnerAuthor

咋用，还请赐教。@muzea

chaoren1641

chaoren1641 commented on Aug 20, 2017

@chaoren1641
chaoren1641
on Aug 20, 2017

杀死那个装逼的 😆

muzea

muzea commented on Aug 20, 2017

@muzea
muzea
on Aug 20, 2017

@jawil

(23333333).toLocaleString('en-US')
Germxu

Germxu commented on Aug 20, 2017

@Germxu
Germxu
on Aug 20, 2017

🐸真正的大佬。。。

jawil

jawil commented on Aug 20, 2017

@jawil
jawil
on Aug 20, 2017
OwnerAuthor

学习了，6666，我知道那些感觉都弱爆了。。。 @muzea

joe223

joe223 commented on Aug 20, 2017

@joe223
joe223
on Aug 20, 2017

2333 that's greateeeeee

violaY33

violaY33 commented on Aug 20, 2017

@violaY33
violaY33
on Aug 20, 2017

竟还有这种操作 😳

joe223

joe223 commented on Aug 20, 2017

@joe223
joe223
on Aug 20, 2017

还有个布尔值的处理 eg:!!0 === false

fXy-during

fXy-during commented on Aug 20, 2017

@fXy-during
fXy-during
on Aug 20, 2017 · edited by fXy-during

让js脚本永远不报错的方法：
window.onerror = function(m, f, l){ return true }

115 remaining items

juntingl

juntingl commented on Nov 28, 2017

@juntingl
juntingl
on Nov 28, 2017

邀请码?在哪呢？

ruanshr
mentioned this on Nov 28, 2017
DLJames

DLJames commented on Dec 15, 2017

@DLJames
DLJames
on Dec 15, 2017

第十条 就给你破了
2.99999999999999999>>0 就不等于2，
哈哈哈哈

gsgfdsgf

gsgfdsgf commented on Dec 31, 2017

@gsgfdsgf
gsgfdsgf
on Dec 31, 2017 · edited by gsgfdsgf

一个ul里面有500个li，问：如何优雅地把li倒序

把每个li旋转180度，再把ul旋转180度……

0xinhua

0xinhua commented on Jan 2, 2018

@0xinhua
0xinhua
on Jan 2, 2018

安利一波这个30秒code，里面全是简短实用JS代码。

xiaorong61

xiaorong61 commented on Feb 24, 2018

@xiaorong61
xiaorong61
on Feb 24, 2018 · edited by xiaorong61

金钱格式化：
image

yanche

yanche commented on May 20, 2018

@yanche
yanche
on May 20, 2018

第一个，既然取值是1~5，那空星星只要四个就够了 233

xqin

xqin commented on Jun 8, 2018

@xqin
xqin
on Jun 8, 2018

第28的那个 find 函数式版本的, 属于装B失败的类型..

因为修改之后的版本是有bug的..

函数的递归调用是有栈的大小限制的, 可以看下面的代码.

//函数式的版本
const find = ( f => f(f) ) ( f =>
  (next => (x, y, i = 0) =>
    ( i >= x.length) ?  null :
      ( x[i] == y ) ? i :
        next(x, y, i+1))((...args) =>
          (f(f))(...args)))

let arr = [];
for(var i=0; i<0xffff; i++) {
  arr.push(i)
}
console.log(find(arr, -1))

RangeError: Maximum call stack size exceeded

而普通的写法就没有这个问题:


function find (x, y) {
  for ( let i = 0; i < x.length; i++ ) {
    if ( x[i] == y ) return i;
  }
  return null;
}
let arr = [];
for(var i=0; i<0xffff; i++) {
  arr.push(i)
}
console.log(find(arr, -1))
MRlijiawei
mentioned this on Aug 22, 2018
polaris-dxz

polaris-dxz commented on Oct 26, 2018

@polaris-dxz
polaris-dxz
on Oct 26, 2018

用 new 关键字实现自调用函数那里，少了一个括号。文章整理的不错，佩服

LastHeaven

LastHeaven commented on Jan 14, 2019

@LastHeaven
LastHeaven
on Jan 14, 2019

一行代码递归实现斐波那契数列

const fib = (f => f(f))(f => n => [1, 1][n] || f(f)(n - 1) + f(f)(n - 2))
xineur
mentioned this on Feb 21, 2019
yushengyuan1993

yushengyuan1993 commented on Mar 11, 2019

@yushengyuan1993
yushengyuan1993
on Mar 11, 2019

受教了，确实很多黑科技。但有时候晦涩难懂的代码不太适合写在实际业务中鸭，也得考虑一下跟你合作的的小伙伴的感受。。。哈哈哈

ahalf-yuan
mentioned this on Mar 26, 2019
xgqfrms

xgqfrms commented on Sep 27, 2020

@xgqfrms
xgqfrms
on Sep 27, 2020 · edited by xgqfrms

✅ you can void anything, it always returns undefined!

void 0 === void(0);
// true

void 0 === void(true);
// true

void false === void(true);
// true

void alert("✅ you can `void` anything, it always returns `undefined`!");
// undefined

image

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          这些JavaScript编程黑科技，装逼指南，高逼格代码，让你惊叹不已 · Issue #24 · jawil/blog