reverse! ( seq -- seq )
Factor handbook » The language » Collections » Sequence operations » Destructive sequence operations

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Vocabulary
sequences

Inputs

seq	a mutable sequence

Outputs

seq	a mutable sequence

Word description
Reverses a sequence in-place and outputs that sequence.

Side effects
Modifies seq

See also
reverse, <reversed>

Definition

USING: kernel math sequences.private ;

IN: sequences

: reverse! ( seq -- seq )
    [
        [ midpoint ] [ length ] [ ] tri
        [ [ over - 1 - ] dip exchange-unsafe ] 2curry
        each-integer
    ] keep ;