Pop
Pop is a collection operation that removes an element according to the collection's defined pop semantics, often returning the removed element or the updated collection.
Clojure: The Essential Reference
pop is a Clojure function that returns a collection with its end element removed according to the collection's pop semantics.
- How it is used
- Uses pop to remove collection heads, implement stack and queue operations, and traverse vectors from the end.
- How deep it goes
- Defines the contract, supported interfaces, collection-specific semantics, exceptions, nil behavior, and performance contrast with butlast.
- Examples
- Demonstrates vector, list, and queue removal, delimiter checking, and reverse traversal with peek and pop.
- What you can do after
- Apply pop to supported persistent collections while selecting behavior appropriate to stacks, queues, vectors, and sequence processing.
Get Programming with JavaScript Next: New features of ECMAScript 2015, 2016, and beyond
An array method that removes the last element from an array and returns it.
- How it is used
- Deals the top card from a Blackjack deck represented as a Set.
- How deep it goes
- Shows the array conversion, last-element removal, card update, Set deletion, and return value.
- Examples
- Uses a Blackjack deck and a function that returns the last card while removing it from the deck.
- What you can do after
- Apply it via Array.pop to retrieve the last item after converting a Set to an array.
The Well-Grounded Rubyist, Fourth Edition
Array#pop is a Ruby Array method that removes and returns one or more objects from the end of an array.
- How it is used
- Removes trailing elements while processing or manipulating an array.
- How deep it goes
- Defines single and counted removal, return shapes, mutation, and contrast with shift.
- Examples
- Uses integer arrays and word arrays to demonstrate single-element and multiple-element removal.
- What you can do after
- Apply it via Ruby's Array API to remove and capture one or several trailing elements.
Read how The Well-Grounded Rubyist, Fourth Edition explains pop →
Grokking Data Structures
A pop method is a stack operation that removes and returns the most recently added element.
- How it is used
- Removes and returns the latest stack element while enforcing last-in, first-out access.
- How deep it goes
- Defines the operation, empty-stack error handling, linked-list delegation, and array-versus-list performance tradeoffs.
- Examples
- Uses a pile-of-dishes analogy, an empty-stack ValueError, and a singly linked list as the underlying storage.
- What you can do after
- Implement pop with an empty check, a clear exception, and delegated removal from array or linked-list storage.
Related concepts
- arrayuses · An array is an indexed, ordered collection of elements arranged in one or more dimensions, with elements accessed by position.
- listuses · A list is an ordered collection of elements arranged in a sequence.
- stackpart of · A stack is a data structure that adds and removes elements at one end, following last-in, first-out order.
- indexinguses · Indexing is the organization or use of positions, keys, or lookup structures to identify and retrieve selected data or elements.
- Mapuses · A map is an associative data structure that stores key-value pairs and supports retrieving values by key.
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