pop ( seq -- elt )
Factor handbook » The language » Collections » Sequence operations » Treating sequences as stacks

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Vocabulary
sequences

Inputs

seq	a resizable mutable sequence

Outputs

elt

an object

Word description
Outputs the last element after removing it and shortening the sequence.

Side effects
Modifies seq

Errors
Throws an error if the sequence is empty.

See also
push, push-either, push-when, pop*, prefix, suffix, suffix!

Definition

USING: kernel math sequences.private ;

IN: sequences

: pop ( seq -- elt )
    index-of-last over 0 >=
    [ [ nth-unsafe ] [ shorten ] 2bi ] [ bounds-error ] if ;