compose ( quot1 quot2 -- compose ) - Factor Documentation

compose ( quot1 quot2 -- compose )
Callables

Vocabulary
kernel

Inputs

Outputs

compose a composed

Word description
Quotation composition. Outputs a callable which calls quot1 followed by quot2.

Notes
The following two lines are equivalent:

compose call append call

However, compose runs in constant time, and the optimizing compiler is able to compile code which calls composed quotations.

See also
curry , curried , prepose , composed

Definition

USING: classes.tuple.private quotations slots ;

IN: kernel

: compose ( quot1 quot2 -- compose )
[ dup callable? [ \ callable bad-slot-value ] unless ] dip
dup callable? [ \ callable bad-slot-value ] unless
{ composed 2 1 tuple 236985587512 composed 3772598122078 }
<tuple-boa> ; flushable