conj = conjoin
(conj [1 2 3] 4) --> [1 2 3 4]
note: Vector letak new item di belakang
for list:
(conj '(1 2 3) 4 ) ---> '(4 1 2 3)
note: List letak new item di depan
For reference:
[ ] array/vector
'( ) list
#{ } set
{ } map
#" " regular expression
