✅ Swift Stack Using Array

struct Stack<T> { private var elements: [T] = [] // Push an element onto the stack mutating func push(_ value: T) { elements.append(value) } // Pop an element from the top of the stack mutating func pop() -> T? { return elements.popLast() } // Peek at the top element without removing it func peek() -> T? { return elements.last } // Check if the stack is empty func isEmpty() -> Bool { return elements.isEmpty } // Get the current size of the stack func size() -> Int { return elements.count } } 🧪 Example Usage: var stack = Stack<Int>() stack.push(10) stack.push(20) stack.push(30) print(stack.peek() ?? "Empty") // Output: 30 print(stack.pop() ?? "Empty") // Output: 30 print(stack.size()) // Output: 2 print(stack.isEmpty()) // Output: false stack.pop() stack.pop() print(stack.isEmpty()) // Output: true