pop-back ( deque -- item newdeque )
Persistent deques

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Vocabulary
persistent.deques

Inputs

deque

an object

Outputs

item	an object
newdeque	a deque

Word description
Creates a new deque with the backmost item removed. This takes amortized constant time with single-threaded access.

Definition

USING: persistent.deques.private ;

IN: persistent.deques

: pop-back ( deque -- item newdeque ) [ pop ] flipped ;