exchange ( m n seq -- )
Factor handbook » The language » Collections » Sequence operations » Destructive sequence operations

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Vocabulary
sequences

Inputs

m	a non-negative integer
n	a non-negative integer
seq	a mutable sequence

Outputs
None

Word description
Exchanges the mth and nth elements of seq.

Definition

USING: kernel sequences.private ;

IN: sequences

: exchange ( m n seq -- )
    [ nip bounds-check 2drop ] [ bounds-check 3drop ]
    [ exchange-unsafe ] 3tri ;