Navigating to a New Page

When you visit a new URL, what happens? The browser should add it to your history, right? Let's code that part:

1visit(url) {
2    this.history = this.history.slice(0, this.pointer + 1);
3    this.history.push(url);
4    this.pointer++;
5}

What's happening here?

• We first trim the history array up to the current pointer. This is essential because if you navigate to a new URL from a past page, the future history should be erased.
• The new URL is pushed into the history array.
• The pointer is incremented to point to the new current URL.

Moving Back and Forth in History

Now, let's implement the methods that allow us to go back and forth in our browser history:

1back() {
2    this.pointer = Math.max(0, --this.pointer);
3    return this.history[this.pointer];
4}
5
6forward() {
7    this.pointer = Math.min(this.history.length - 1, ++this.pointer);
8    return this.history[this.pointer];
9}

What's happening here?

• back(): Decreases the pointer but ensures it doesn't go below 0 using Math.max().
• forward(): Increases the pointer but ensures it doesn't exceed the length of the history array using Math.min().