!![]+!![] + !+[]+!+[]+!+[] ＝？？？

#答えは５

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何をしているのか謎な人も多いと思う。
気付いた人はすごいと思う

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##JSFuck

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JSFuckはJavaScriptのサブセットである難解プログラミング言語で、コードは[,], (、)、!と+の6文字で構成される。ネーミングセンスはBrainfuckを参考にしていて、難解プログラミング言語の中ではアルファベットが一文字も使われない。コンパイラやインタプリタを必要とするBrainfuckとは異なり、WebブラウザやJavaScriptエンジンで動作させることができる。JSFuckはJavaScriptが動的型付けのため、完全にJavaScriptの関数を上記の6文字で置き換えることができる。2009年7月にハセガワヨウスケがJavaScriptを!+,"$.:;_{}~=の18文字に変換するWebアプリケーションを作った。

Wikiより

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####何をしているのか

例題

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console.log(![])

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console.log(![])
⇒false

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console.log(!![])
⇒

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console.log(!![])
⇒True

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console.log(+![])
⇒

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console.log(+![])
⇒0

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console.log(+!![])
⇒

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console.log(+!![])
⇒1

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console.log([][0]+[])
⇒

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console.log([][0]+[])
⇒"undefined"

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前提
! ⇒　論理否定演算子
Arrayに+演算子は定義されていない
Boolean([])　⇒　True
単項演算子としての + は、boolean を number にキャスト
[][0]　は　undefined
![]　は　False
!![]　は True

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配列と演算子について理解していれば
色々できるね

例えば
console.log(([][[]]+[])[+!![]])
⇒　n

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これ応用すれば文字列も作れる

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

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need

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分解するとこう

([][[]]+[])[+!+[]] ⇒n
(!![]+[])[!+[]+!+[]+!+[]] ⇒e
(!![]+[])[!+[]+!+[]+!+[]] ⇒e
([][[]]+[])[!+[]+!+[]] ⇒d

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内容的には基本的な事だけだがちゃんと理解した上で使うと色々面白いこと出来そう

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ちな俺の嫁

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