The methods defined from the Deque API page in QQKachoo are as follows.

• size() - returns length of the queue, needed for isEmpty()
• addFirst() - adds value to the front of the queue
• addLast() - adds value to the end of the queue
• peekFirst() - returns the value at the front of the queue
• peekLast() - returns the value at the end of the queue
• removeFirst() - removes the first element of the queue and returns it
• removeLast() - removes the last element of the queue and returns it
• removeFirstOccurrence() - removes the first occurrence of the value in the queue from the front. If not found, return null
• removeLastOccurrence() - removes the last of occurrence of the value in the queue from the front. If not found, return null
• Iterator() - iterate through the queue
• poll() - safely removes the first element in the queue. If there are no elements remaining, return null
• pollFirst() - safely remove the first element in the queue. If there are no elements remaining, return null
• offerFirst() - safely add the value to the front of the queue. If it violates anything, return false, else, return true
• offerLast() - safely add the value to the end of the queue. If it violates anything, return false, else, return true
• contains() - iterate through the queue to check if the value is in the queue. If found, return true, else return false

Note that the implementation of the methods may not reflect the order that they were placed in in the README

See Projects tab for to-do list and details

A doubly linked node-based architecture was implemented because it allows easy trasversal between nodes, and saves both time and memory by having both a front an end modifiable in constant time.

The various elements explored in this repo stems from the Deque class available in the Java API. The methods are developed through a bottom-up approach where the most basic of the methods are added and revised by a team of three.

4 steps of maintaining runnability (To-do list):

1. Maintain runnability
2. Implement basic methods as listed above
3. Generic type Interface and class
4. Implement Iterator in Deque

Kevin Wang (GitHub profile of Kevin Wang)

Peter Cwalina (GitHub profile of Peter Cwalina)

Ahnaf Hasan (GitHub profile of Ahnaf Hasan)