Anonymous recursion: Difference between revisions

=={{header|APL}}==

APL has the symbol <code>∇</code> which calls the current function recursively.

Functions can be defined and then called in place without ever assigning them a name,

though they are not quite first-class objects (you can't have an array of functions for example).

<lang APL>fib←{ ⍝ Outer function

⍵<0:⎕SIGNAL 11 ⍝ DOMAIN ERROR if argument < 0

{ ⍝ Inner (anonymous) function

⍵<2:⍵

(∇⍵-1)+∇⍵-2 ⍝ ∇ = anonymous recursive call

}⍵ ⍝ Call function in place

}</lang>