Comments

(* This is a comment *)

Strings

"foo bar baz"

Numbers

7
3.14
10.
.001
1e100
3.14e-10
2147483647

Full example

(* Most operators are supported *)
f /@ {1, 2, 3};
f @@ Range[10];
f @@@ y;
Module[{x=1}, 
    Return @ $Failed
]