Monadic first

Rеturns the first element from x if x is a list, else rеturns x.

Syntax: first <x>; first[<x>]; *<x>

o)first 1 2 3 4
1
o)first 1
1
o)* 1 2 3 4
1
o)* 1
1
o)first ("asd";1 2 3 4)
"asd"
o)first each ("asd";1 2 3 4)
"asd"
1
o)