Comments

#!/usr/bin/env runapl
a←1 2 3 ⍝ this is a comment

Strings

''
'foobar'
'foo''bar''baz'

Numbers

42
3.14159
¯2
∞
2.8e¯4
2j3
¯4.3e2J1.9e¯4

Primitive functions

a+b×c⍴⍳10

Operators

+/ f⍣2

Dfns

{0=⍴⍴⍺:'hello' ⋄ ∇¨⍵}