whyNot.js

a = ([]+![]) [+!![]]
c = ([]+ [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]] // []['flat'][3]
d = ([]+[][[]]) [!![]+!![]]
e = ([]+!![]) [!![]+!![]+!![]]
f = ([]+![]) [+[]]
i = ([]+[][[]]) [!![]+!![]+!![]+!![]+!![]]
l = ([]+![]) [!![]+!![]]
n = ([]+[][[]])[+!![]]  // undefined[1]
o = ([] + [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]+!![]+!![]+!![]] // function[6]
r = ([]+!![]) [+!![]]
s = ([]+![])[!![]+!![]+!![]] // false[3]
t = ([]+!![]) [+[]]
u = ([]+!![])[!![]+!![]] // true[2]
w = (  // (32).toString(36)
  (+(([]+ (!![]+!![]+!![])) + ([]+ (!![]+!![]))))[
      ([]+!![]) [+[]]
      + ([] + [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]+!![]+!![]+!![]]
      + (  // ([]+ ([]+[]).constructor)[9]
            ([]+ ([]+[])[ 
                (
                    ([]+ [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]]
                    + ([] + [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]+!![]+!![]+!![]]
                    + ([]+[][[]])[+!![]]
                    + ([]+![])[!![]+!![]+!![]]
                    + ([]+!![]) [+[]]
                    + ([]+!![]) [+!![]]
                    + ([]+!![])[!![]+!![]]
                    + ([]+ [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]]
                    + ([]+!![]) [+[]]
                    + ([] + [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]+!![]+!![]+!![]]
                    + ([]+!![]) [+!![]]
                )
            ])[
                !![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]
            ]
        )
      + ([]+!![]) [+[]]
      + ([]+!![]) [+!![]]
      + ([]+[][[]]) [!![]+!![]+!![]+!![]+!![]]
      + ([]+[][[]])[+!![]]
      + (  // ([]+ ([]+[]).constructor)[9]
            ([]+ ([]+[])[ 
                (
                    ([]+ [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]]
                    + ([] + [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]+!![]+!![]+!![]]
                    + ([]+[][[]])[+!![]]
                    + ([]+![])[!![]+!![]+!![]]
                    + ([]+!![]) [+[]]
                    + ([]+!![]) [+!![]]
                    + ([]+!![])[!![]+!![]]
                    + ([]+ [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]]
                    + ([]+!![]) [+[]]
                    + ([] + [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]+!![]+!![]+!![]]
                    + ([]+!![]) [+!![]]
                )
            ])[
                +(([]+ (+!![])) + ([]+ (!![]+!![]+!![]+!![])))
            ]
        )
  ](
      +(([]+ (!![]+!![]+!![])) + ([]+ (!![]+!![]+!![]+!![]+!![]+!![])))
  )
)

C = (  // atob(btoa('1')[1] + 'w')

)

S = (  // ([]+ ([]+[]).constructor)[9]
    ([]+ ([]+[])[ 
        (
            ([]+ [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]]
            + ([] + [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]+!![]+!![]+!![]]
            + ([]+[][[]])[+!![]]
            + ([]+![])[!![]+!![]+!![]]
            + ([]+!![]) [+[]]
            + ([]+!![]) [+!![]]
            + ([]+!![])[!![]+!![]]
            + ([]+ [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]]
            + ([]+!![]) [+[]]
            + ([] + [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]+!![]+!![]+!![]]
            + ([]+!![]) [+!![]]
        )
    ])[
        !![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]
    ]
)

g = (  // ([]+ ([]+[]).constructor)[9]
    ([]+ ([]+[])[ 
        (
            ([]+ [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]]
            + ([] + [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]+!![]+!![]+!![]]
            + ([]+[][[]])[+!![]]
            + ([]+![])[!![]+!![]+!![]]
            + ([]+!![]) [+[]]
            + ([]+!![]) [+!![]]
            + ([]+!![])[!![]+!![]]
            + ([]+ [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]]
            + ([]+!![]) [+[]]
            + ([] + [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]+!![]+!![]+!![]]
            + ([]+!![]) [+!![]]
        )
    ])[
         +(([]+ (+!![])) + ([]+ (!![]+!![]+!![]+!![])))
    ]
)

0 = +[]
1 = +!![]
2 = !![]+!![]
3 = !![]+!![]+!![]
4 = !![]+!![]+!![]+!![]
5 = !![]+!![]+!![]+!![]+!![]
6 = !![]+!![]+!![]+!![]+!![]+!![]
9 = !![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]

14 = +(([]+ (+!![])) + ([]+ (!![]+!![]+!![]+!![])))
32 = +(([]+ (!![]+!![]+!![])) + ([]+ (!![]+!![]))) // +(([]+ 3) + ([]+ 2))
36 = +(([]+ (!![]+!![]+!![])) + ([]+ (!![]+!![]+!![]+!![]+!![]+!![])))

false = ([]+![])
true = ([]+!![])
undefined = ([]+[][[]])

filter = ([]+![])[+[]] + ([]+[][[]])[!![]+!![]+!![]+!![]+!![]] + ([]+![]) [!![]+!![]] + ([]+!![])[+[]] + ([]+!![]) [!![]+!![]+!![]] + ([]+!![]) [+!![]]
flat = ([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]
function... = ([] + [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])
constructor = (
    ([]+ [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]]
    + ([] + [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]+!![]+!![]+!![]]
    + ([]+[][[]])[+!![]]
    + ([]+![])[!![]+!![]+!![]]
    + ([]+!![]) [+[]]
    + ([]+!![]) [+!![]]
    + ([]+!![])[!![]+!![]]
    + ([]+ [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]]
    + ([]+!![]) [+[]]
    + ([] + [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]+!![]+!![]+!![]]
    + ([]+!![]) [+!![]]
)

eval = (  // []['flat']['constructor']
    [][
        ([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]
    ][
        (
            ([]+ [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]]
            + ([] + [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]+!![]+!![]+!![]]
            + ([]+[][[]])[+!![]]
            + ([]+![])[!![]+!![]+!![]]
            + ([]+!![]) [+[]]
            + ([]+!![]) [+!![]]
            + ([]+!![])[!![]+!![]]
            + ([]+ [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]]
            + ([]+!![]) [+[]]
            + ([] + [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]+!![]+!![]+!![]]
            + ([]+!![]) [+!![]]
        )
    ]
)


toString = (  // (<number>).toString(36)
    (<number>)[
      ([]+!![]) [+[]]
      + ([] + [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]+!![]+!![]+!![]]
      + (  // ([]+ ([]+[]).constructor)[9]
            ([]+ ([]+[])[ 
                (
                    ([]+ [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]]
                    + ([] + [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]+!![]+!![]+!![]]
                    + ([]+[][[]])[+!![]]
                    + ([]+![])[!![]+!![]+!![]]
                    + ([]+!![]) [+[]]
                    + ([]+!![]) [+!![]]
                    + ([]+!![])[!![]+!![]]
                    + ([]+ [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]]
                    + ([]+!![]) [+[]]
                    + ([] + [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]+!![]+!![]+!![]]
                    + ([]+!![]) [+!![]]
                )
            ])[
                !![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]+!![]
            ]
        )
      + ([]+!![]) [+[]]
      + ([]+!![]) [+!![]]
      + ([]+[][[]]) [!![]+!![]+!![]+!![]+!![]]
      + ([]+[][[]])[+!![]]
      + (  // ([]+ ([]+[]).constructor)[9]
            ([]+ ([]+[])[ 
                (
                    ([]+ [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]]
                    + ([] + [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]+!![]+!![]+!![]]
                    + ([]+[][[]])[+!![]]
                    + ([]+![])[!![]+!![]+!![]]
                    + ([]+!![]) [+[]]
                    + ([]+!![]) [+!![]]
                    + ([]+!![])[!![]+!![]]
                    + ([]+ [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]]
                    + ([]+!![]) [+[]]
                    + ([] + [][([]+![])[+[]] + ([]+![])[!![]+!![]] + ([]+![])[+!![]] + ([]+!![])[+[]]])[!![]+!![]+!![]+!![]+!![]+!![]]
                    + ([]+!![]) [+!![]]
                )
            ])[
                +(([]+ (+!![])) + ([]+ (!![]+!![]+!![]+!![])))
            ]
        )
  ](+(([]+ (!![]+!![]+!![])) + ([]+ (!![]+!![]+!![]+!![]+!![]+!![]))))  // base 36
)