Vocabulary
kernel

Inputs and outputs

x	an object
y	an object
z	an object
quot	a quotation with stack effect ( obj -- ... )

Word description
Applies the quotation to x, then to y, and finally to z.

Examples
The following two lines are equivalent:

[ p ] tri@ [ [ p ] dip p ] dip p

The following two lines are also equivalent:

[ p ] tri@ [ p ] [ p ] [ p ] tri*

Definition

IN: kernel

: tri@ ( x y z quot -- ) dup dup tri* ; inline