?<slice> ( from/f to/f sequence -- slice )

Vocabulary

sequences.extras

Inputs

from/f	an integer or f
to/f	an integer or f
sequence	a sequence

Outputs

slice

a slice

Word description

Outputs a new virtual sequence sharing storage with the subrange of elements in seq with indices starting from and including from/f, and up to but not including to/f. If either of these is not specified, they are substituted with the array's bounds: 0 and its length.

Definition

USING: kernel sequences ;

IN: sequences.extras

: ?<slice> ( from/f to/f sequence -- slice )
    [ [ 0 ] unless* ] 2dip over [ nip [ length ] [ ] bi ] unless
    <slice> ; inline