How do I implement a stack in Swift?

In Swift, you can implement a stack using an array or by creating a custom stack class. Below is a simple example of a stack implementation using a class that provides the necessary operations like push, pop, and peek.


    class Stack {
        private var elements: [Element] = []
        
        // Push an element onto the stack
        func push(_ element: Element) {
            elements.append(element)
        }
        
        // Pop an element off the stack
        func pop() -> Element? {
            return elements.popLast()
        }
        
        // Peek at the top element of the stack
        func peek() -> Element? {
            return elements.last
        }
        
        // Check if the stack is empty
        func isEmpty() -> Bool {
            return elements.isEmpty
        }
        
        // Get the size of the stack
        func size() -> Int {
            return elements.count
        }
    }

    // Example usage
    let stack = Stack()
    stack.push(1)
    stack.push(2)
    stack.push(3)
    print(stack.pop())  // Outputs: 3
    print(stack.peek())  // Outputs: 2
    print(stack.isEmpty())  // Outputs: false

How do I implement a stack in Swift?

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How do I implement a stack in Swift?

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