map-index-as ( ... seq quot: ( ... elt index -- ... newelt ) exemplar -- ... newseq )

map-index-as ( ... seq quot: ( ... elt index -- ... newelt ) exemplar -- ... newseq )
Factor handbook » The language » Collections » Sequence operations » Sequence combinators

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Vocabulary
sequences

Inputs

seq	a sequence
quot	a quotation with stack effect ( ... elt index -- ... newelt )
exemplar	a sequence

Outputs

newseq

a sequence

Word description
Calls the quotation with the element of the sequence and its index on the stack, with the index on the top of the stack. Collects the outputs of the quotation and outputs them in a sequence of the same type as the exemplar sequence.

Examples

USING: arrays sequences prettyprint ; { 10 20 30 } [ 2array ] V{ } map-index-as .
V{ { 10 0 } { 20 1 } { 30 2 } }

See also
map, map!, map-as, map-index

Definition

USING: kernel ;

IN: sequences

: map-index-as
( ... seq quot: ( ... elt index -- ... newelt ) exemplar -- ... newseq )
[ dup length <iota> ] 2dip 2map-as ; inline