Thun/docs/reference/x.md

Combinator Take a quoted function `F` and run it with itself as the first item on the stack. [F] x

## x Combinator Take a quoted function F and run it with itself as the first item on the stack. [F] x

   [F] F

Definition

dup i

Discussion

The simplest recursive pattern.

See the Recursion Combinators notebook. as well as Recursion Theory and Joy by Manfred von