map-index ( ... seq quot: ( ... elt index -- ... newelt ) -- ... 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 )

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 input sequence.

Examples

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

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

Definition

USING: kernel ;

IN: sequences

: map-index
    ( ... seq quot: ( ... elt index -- ... newelt ) -- ... newseq )
    over map-index-as ; inline