Vocabulary
sequences

Inputs and outputs

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

Word description
Applies the quotation to each element of the sequence in order. The new elements are collected into a sequence of the same class as exemplar.

Examples
The following example converts a string into an array of one-element strings:

USING: prettyprint strings sequences ; "Hello" [ 1string ] { } map-as .
{ "H" "e" "l" "l" "o" }

Note that map could not be used here, because it would create another string to hold results, and one-element strings cannot themselves be elements of strings.

Definition

USING: kernel sequences.private ;

IN: sequences

: map-as
( ... seq quot: ( ... elt -- ... newelt ) exemplar -- ... newseq )
[ (each) ] dip map-integers ; inline