unrolled-map-index ( seq len quot: ( x i -- newx ) -- newseq )
Unrolled sequence iteration combinators

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Vocabulary
sequences.unrolled

Inputs

seq	a sequence
len	an integer
quot	a quotation with stack effect ( x i -- newx )

Outputs

newseq

a sequence

Word description
Unrolled version of map-index that maps over the first len elements of seq. len must be a compile-time constant. If seq has fewer than len elements, raises an unrolled-bounds-error.

Definition

USING: kernel sequences ;

IN: sequences.unrolled

: unrolled-map-index
    ( seq len quot: ( x i -- newx ) -- newseq )
    [ dup length <iota> ] 2dip unrolled-2map ; inline