A stack is a data structure that allows for the storage and retrieval of items in a Last In, First Out (LIFO) manner. This means that the last item added to the stack will be the first item to be removed.
In Swift, a stack can be implemented using an array and the following methods:
push(_ item: T) -- adds an element to the top of the stack
pop() -> T? -- removes and returns the element at the top of the stack
peek: T? —
isEmpty: Bool -- returns a boolean indicating if the stack is empty
In Swift, a stack can be implemented using an array and the following methods:
push(_ item: T) -- adds an element to the top of the stack
pop() -> T? -- removes and returns the element at the top of the stack
peek: T? —
isEmpty: Bool -- returns a boolean indicating if the stack is empty
In the context of a web browser, a stack can be used to store the history of pages visited. When a user clicks on a link, the current page is pushed onto the stack and the new page is displayed. If the user then clicks the back button, the previous page is popped from the stack and displayed. This allows the user to easily navigate through their browsing history.
Here is an example to illustrate that. First, we define two classes, WebPage and WebBrowser, which simulate a basic web browsing functionality.
Here is an example to illustrate that. First, we define two classes, WebPage and WebBrowser, which simulate a basic web browsing functionality.
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Next, we create an instance of the WebBrowser class named webBrowser. Call the loadPage method on webBrowser twice to simulate loading two web pages: "www.hamdouchi.com" and "www.hamdouchi.com/web.html".
After that, we call the navigateBack method three times to simulate navigating back to previously visited pages. The output of each navigation is printed.
Finally, we call navigateBack one more time to simulate navigating back when the browser is empty. It prints a message indicating that the browser is empty.
After that, we call the navigateBack method three times to simulate navigating back to previously visited pages. The output of each navigation is printed.
Finally, we call navigateBack one more time to simulate navigating back when the browser is empty. It prints a message indicating that the browser is empty.
Stacks are a fundamental data structure in Swift that offer simplicity, efficiency, and versatility. They find applications in various programming scenarios, ranging from memory management to algorithmic problem-solving and user interface interactions.
