Writing a sentence without using the Alphabet - Part 2

August 04, 2019

Translated by readers into: English
Read the original • Improve this translation • View all translated posts

Previous post: Writing a sentence without using the Alphabet

In my previous post, I wrote that I couldn’t make some characters, but I found one that suggested a solution to the problem within a few days. And there was already an implementation that created JavaScript code with only six characters ( ) + [ ] !. Hieroglyphy, JSF*ck

I was a bit sad that there was already such a code converter, but the content was so interesting that I implemented it myself.

Enter text below to convert all characters, including alphabets and numbers, into code.

new line explanation remove space operators - * /

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  ([] + {})[+!![] + [+!![]]] +   // 'e' == '[object Object]'[11]
  (![] + [])[!+[] + !![]] +      // 'l' == 'false'[2]
  (![] + [])[!+[] + !![]] +      // 'l' == 'false'[2]
  ([] + {})[+!![]] +             // 'o' == '[object Object]'[1]
  (+{} + {})[+!![] + [+[]]] +    // ' ' == ('NaN' + '[object Object]')[10]
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  (({})[(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]][(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(+{}+{})[+!![]+[+[]]]+([][[]]+[])[+[]]+([][[]]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(![]+[])[!+[]+!![]+!![]]+(![]+{})[+!![]+[+[]]]+(![]+[])[+!![]]+(({})[(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]][(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(+{}+{})[+!![]+[+[]]]+(![]+[])[!+[]+!![]]+([]+{})[+!![]]+(![]+{})[+!![]+[+[]]]+(![]+[])[+!![]]+(!![]+[])[+[]]+(![]+[]+[][[]])[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]])()+[])[!+[]+!![]+!![]]+([]+{})[+!![]+[+!![]]])()((({})[(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]][(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(+{}+{})[+!![]+[+[]]]+([]+{})[+!![]+[+!![]]]+(![]+[])[!+[]+!![]+!![]]+(![]+{})[+!![]+[+[]]]+(![]+[])[+!![]]+(({})[(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]][(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(+{}+{})[+!![]+[+[]]]+(![]+[])[!+[]+!![]]+([]+{})[+!![]]+(![]+{})[+!![]+[+[]]]+(![]+[])[+!![]]+(!![]+[])[+[]]+(![]+[]+[][[]])[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]])()+[])[+(!+[]+!![]+!![])]+([]+{})[+!![]+[+!![]]])()(([]+{})[+[]]))[+[]]+([][[]]+[])[+[]]+([]+{})[!+[]+!![]]+(+!![]+[!+[]+!![]+!![]+!![]+!![]]+[!+[]+!![]+!![]+!![]+!![]]))) + 
  (+{} + {})[+!![] + [+[]]] +    // ' ' == ('NaN' + '[object Object]')[10]
  (({})[(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]][(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(+{}+{})[+!![]+[+[]]]+([][[]]+[])[+[]]+([][[]]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(![]+[])[!+[]+!![]+!![]]+(![]+{})[+!![]+[+[]]]+(![]+[])[+!![]]+(({})[(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]][(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(+{}+{})[+!![]+[+[]]]+(![]+[])[!+[]+!![]]+([]+{})[+!![]]+(![]+{})[+!![]+[+[]]]+(![]+[])[+!![]]+(!![]+[])[+[]]+(![]+[]+[][[]])[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]])()+[])[!+[]+!![]+!![]]+([]+{})[+!![]+[+!![]]])()((({})[(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]][(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(+{}+{})[+!![]+[+[]]]+([]+{})[+!![]+[+!![]]]+(![]+[])[!+[]+!![]+!![]]+(![]+{})[+!![]+[+[]]]+(![]+[])[+!![]]+(({})[(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]][(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(+{}+{})[+!![]+[+[]]]+(![]+[])[!+[]+!![]]+([]+{})[+!![]]+(![]+{})[+!![]+[+[]]]+(![]+[])[+!![]]+(!![]+[])[+[]]+(![]+[]+[][[]])[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]])()+[])[+(!+[]+!![]+!![])]+([]+{})[+!![]+[+!![]]])()(([]+{})[+[]]))[+[]]+([][[]]+[])[+[]]+([][[]]+[])[!+[]+!![]]+(!+[]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+[!+[]+!![]+!![]])+([][[]]+[])[!+[]+!![]]+(({})[(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]][(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(+{}+{})[+!![]+[+[]]]+([]+{})[+!![]+[+!![]]]+(![]+[])[!+[]+!![]+!![]]+(![]+{})[+!![]+[+[]]]+(![]+[])[+!![]]+(({})[(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]][(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(+{}+{})[+!![]+[+[]]]+(![]+[])[!+[]+!![]]+([]+{})[+!![]]+(![]+{})[+!![]+[+[]]]+(![]+[])[+!![]]+(!![]+[])[+[]]+(![]+[]+[][[]])[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]])()+[])[+(!+[]+!![]+!![])]+([]+{})[+!![]+[+!![]]])()(([]+{})[+[]]))[+[]]+([][[]]+[])[+[]]+([][[]]+[])[!+[]+!![]]+(![]+{})[+!![]+[+[]]]+(!+[]+!![]+!![]+!![])+([]+{})[!+[]+!![]]))
// -> 'Hello 안녕 👋'

Below is a solution from ’Non alphanumeric JavaScript’. The code generator above converts the characters to codes using the following process.

Master Key 🔑

You can use the unescape() function as a master key to generate any character.

The unescape() function computes a new string in which hexadecimal escape sequences are replaced with the character that it represents.

/**
 * @param {string} str - A string to be decoded.
 * @return {string} A new string in which certain characters have been unescaped.
 * @example unescape(str)
 */
unescape('abc123');         // "abc123"
unescape('%uC548%uB155');   // "안녕"
unescape('%uD83D%uDC4B');   // "👋"

As shown in the example above, you can create any character you want with the unescape function and the % + HEXA_ASCII_VALUE value. But to execute that function, two things must be solved.

Convert string to executable script
Two characters p and % are required to create the script unescape(’%41’)
The remaining characters can be obtained by the method described in the previous post.

1. Convert string to executable script

The Function constructor lets you create an executable function.

The Function constructor creates a new Function object. Calling the constructor directly can create functions dynamically.

/**
 * @param {string} arg1, arg1, ...argN
 * @param {string} functionBody
 * @return {function} executable function.
 * @example var sum = Function('a', 'b', 'return a + b');
 */
Function('return unescape')     // ƒ anonymous() { return unescape }
Function('return unescape')()   // ƒ unescape() { [native code] }

The Function constructor can be obtained in the following way.

({}).constructor.constructor    // ƒ Function() { [native code] }

Each character in constructor can be obtained by the method of the previous post. So you can get Function constructor with code like below.

({})
  .constructor          // ƒ Object() { [native code] }
  .constructor          // ƒ Function() { [native code] }
,
({})['constructor']['constructor']
,
({})[
  // 'constructor'
  (![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]
][
  // 'constructor'
  (![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]
]
// -> ƒ Function() { [native code] }

2. Get ‘p’ and ’%’

You can get p and % with Function constructor obtained in step 1.

Get ‘p’

You can get the address of your current website using the Location interface.

location              // Location { ... }
location.href         // 'https://...'
location.toString()   // 'https://...'
location + []         // 'https://...'

The fourth character of the Internet Address Protocol is p. (http:, https:)

({})
  .constructor          // ƒ Object() { [native code] }
  .constructor          // ƒ Function() { [native code] }
  ('return location')   // ƒ anonymous() { return location }
  ()                    // Location { ... }
  + []                  // "https://..."
,
({})['constructor']['constructor']('return location')() + []
,
// ({})['constructor']['constructor']
({})[(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]][(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]
(
  // 'return location'
  (!![]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(+{}+{})[+!![]+[+[]]]+(![]+[])[!+[]+!![]]+([]+{})[+!![]]+(![]+{})[+!![]+[+[]]]+(![]+[])[+!![]]+(!![]+[])[+[]]+(![]+[]+[][[]])[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]
)() + []
// -> 'https://...'

// 'https://...'
(({})[(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]][(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]
((!![]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(+{}+{})[+!![]+[+[]]]+(![]+[])[!+[]+!![]]+([]+{})[+!![]]+(![]+{})[+!![]+[+[]]]+(![]+[])[+!![]]+(!![]+[])[+[]]+(![]+[]+[][[]])[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]
)()+[])
// [3]
[!+[] + !![] + !![]]
// ('https://...')[3] -> 'p'

Get ’%’

Use the escape() function as follows: Just get the first character of the result.

escape('[')    // '%5B'

({})
  .constructor          // ƒ Object() { [native code] }
  .constructor          // ƒ Function() { [native code] }
  ('return escape')     // ƒ anonymous() { return escape }
  ()                    // ƒ escape() { [native code] }
  ('[')                 // "%5B"
,
({})['constructor']['constructor']('return escape')()('[')
,
// ({})['constructor']['constructor']
({})[(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]][(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]
(
  // 'return escape'
  (!![]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(+{}+{})[+!![]+[+[]]]+([]+{})[+!![]+[+!![]]]+(![]+[])[!+[]+!![]+!![]]+(![]+{})[+!![]+[+[]]]+(![]+[])[+!![]]+(({})[(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]][(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(+{}+{})[+!![]+[+[]]]+(![]+[])[!+[]+!![]]+([]+{})[+!![]]+(![]+{})[+!![]+[+[]]]+(![]+[])[+!![]]+(!![]+[])[+[]]+(![]+[]+[][[]])[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]])()+[])[+(!+[]+!![]+!![])]+([]+{})[+!![]+[+!![]]]
)()(
  // '['
  ([]+{})[+[]]
)
// -> '%5B'

// '%5B'
({})[(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]][(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(+{}+{})[+!![]+[+[]]]+([]+{})[+!![]+[+!![]]]+(![]+[])[!+[]+!![]+!![]]+(![]+{})[+!![]+[+[]]]+(![]+[])[+!![]]+(({})[(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]][(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(+{}+{})[+!![]+[+[]]]+(![]+[])[!+[]+!![]]+([]+{})[+!![]]+(![]+{})[+!![]+[+[]]]+(![]+[])[+!![]]+(!![]+[])[+[]]+(![]+[]+[][[]])[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]])()+[])[+(!+[]+!![]+!![])]+([]+{})[+!![]+[+!![]]])()(([]+{})[+[]])
// [0]
[+[]]
// ('%5B')[0] -> '%'

3. unescape function

Finally, you can get the unescape() function,

({})
  .constructor          // ƒ Object() { [native code] }
  .constructor          // ƒ Function() { [native code] }
  ('return unescape')   // ƒ anonymous() { return escape }
  ()                    // ƒ unescape() { [native code] }
,
({})[(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]][(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(+{}+{})[+!![]+[+[]]]+([][[]]+[])[+[]]+([][[]]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(![]+[])[!+[]+!![]+!![]]+(![]+{})[+!![]+[+[]]]+(![]+[])[+!![]]+(({})[(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]][(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(+{}+{})[+!![]+[+[]]]+(![]+[])[!+[]+!![]]+([]+{})[+!![]]+(![]+{})[+!![]+[+[]]]+(![]+[])[+!![]]+(!![]+[])[+[]]+(![]+[]+[][[]])[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]])()+[])[!+[]+!![]+!![]]+([]+{})[+!![]+[+!![]]])()

Now you can create any character you want.

unescape('%ud83c%udf7a')  // "🍺"
,
({})[(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]][(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(+{}+{})[+!![]+[+[]]]+([][[]]+[])[+[]]+([][[]]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(![]+[])[!+[]+!![]+!![]]+(![]+{})[+!![]+[+[]]]+(![]+[])[+!![]]+(({})[(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]][(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(+{}+{})[+!![]+[+[]]]+(![]+[])[!+[]+!![]]+([]+{})[+!![]]+(![]+{})[+!![]+[+[]]]+(![]+[])[+!![]]+(!![]+[])[+[]]+(![]+[]+[][[]])[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]])()+[])[!+[]+!![]+!![]]+([]+{})[+!![]+[+!![]]])()
(
  (({})[(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]][(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(+{}+{})[+!![]+[+[]]]+([]+{})[+!![]+[+!![]]]+(![]+[])[!+[]+!![]+!![]]+(![]+{})[+!![]+[+[]]]+(![]+[])[+!![]]+(({})[(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]][(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(+{}+{})[+!![]+[+[]]]+(![]+[])[!+[]+!![]]+([]+{})[+!![]]+(![]+{})[+!![]+[+[]]]+(![]+[])[+!![]]+(!![]+[])[+[]]+(![]+[]+[][[]])[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]])()+[])[+(!+[]+!![]+!![])]+([]+{})[+!![]+[+!![]]])()(([]+{})[+[]]))[+[]]+([][[]]+[])[+[]]+([][[]]+[])[!+[]+!![]]+((!+[]+!![])**(!+[]+!![]+!![])+[!+[]+!![]+!![]])+(![]+{})[+!![]+[+[]]]+(({})[(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]][(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(+{}+{})[+!![]+[+[]]]+([]+{})[+!![]+[+!![]]]+(![]+[])[!+[]+!![]+!![]]+(![]+{})[+!![]+[+[]]]+(![]+[])[+!![]]+(({})[(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]][(![]+{})[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]]+(![]+[])[!+[]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(![]+{})[+!![]+[+[]]]+(!![]+[])[+[]]+([]+{})[+!![]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+([]+{})[+!![]+[+!![]]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(+{}+{})[+!![]+[+[]]]+(![]+[])[!+[]+!![]]+([]+{})[+!![]]+(![]+{})[+!![]+[+[]]]+(![]+[])[+!![]]+(!![]+[])[+[]]+(![]+[]+[][[]])[+!![]+[+[]]]+([]+{})[+!![]]+([][[]]+[])[+!![]])()+[])[+(!+[]+!![]+!![])]+([]+{})[+!![]+[+!![]]])()(([]+{})[+[]]))[+[]]+([][[]]+[])[+[]]+([][[]]+[])[!+[]+!![]]+(![]+[])[+[]]+((+!![]+[+[]])-(!+[]+!![]+!![]))+(![]+[])[+!![]]
)
// unescape('%ud83c%udf7a') -> '🍺'

It’s really useless to look back after making it, but it was very fun.

If you are interested in this topic, please also see the following resources.