How do I implement queues and stacks in programming?

How do I implement queues and stacks in programming?

To implement queues and stacks, you can use arrays or linked lists. Would you like examples in a specific programming language?

Yes, can you show me an example in Python?

Sure! For a stack, you can use a list and the append() and pop() methods. For a queue, you can use collections.deque for efficient pops from the front.

Can you provide the code for both?

Absolutely! Here's a simple stack implementation:

class Stack:
    def __init__(self):
        self.items = []
    
    def push(self, item):
        self.items.append(item)
    
    def pop(self):
        return self.items.pop() if not self.is_empty() else None
    
    def is_empty(self):
        return len(self.items) == 0

And for a queue:

from collections import deque

class Queue:
    def __init__(self):
        self.items = deque()
    
    def enqueue(self, item):
        self.items.append(item)
    
    def dequeue(self):
        return self.items.popleft() if not self.is_empty() else None
    
    def is_empty(self):
        return len(self.items) == 0

Thanks! How do I test these implementations?

You can create instances of the Stack and Queue classes and call their methods to see how they work. Would you like a testing example?