3map ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... newelt ) -- ... newseq )
Factor handbook » The language » Collections » Sequence operations » Sequence combinators » Triple-wise sequence combinators

Prev:	3each ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... ) -- ... )
Next:	3map-as ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... newelt ) exemplar -- ... newseq )

Vocabulary
sequences

Inputs

seq1	a sequence
seq2	a sequence
seq3	a sequence
quot	a quotation with stack effect ( ... elt1 elt2 elt3 -- ... newelt )

Outputs

newseq

a new sequence

Word description
Applies the quotation to each triple of elements in turn, yielding new elements which are collected into a new sequence having the same class as seq1.

Definition

USING: kernel ;

IN: sequences

: 3map
    ( ... seq1 seq2 seq3 quot: ( ... elt1 elt2 elt3 -- ... newelt ) -- ... newseq )
    pickd swap 3map-as ; inline