1// BrowserHistory class definition
2class BrowserHistory {
3    constructor(url) {
4        this.history = [];
5        this.pointer = -1;
6        if (url !== undefined) {
7            this.history.push(url);
8            this.pointer++;
9        }
10    }
11
12    visit(url) {
13        this.history = this.history.slice(0, this.pointer + 1);
14        this.history.push(url);
15        this.pointer++;
16    }
17
18    back() {
19        this.pointer = Math.max(0, --this.pointer);
20        return this.history[this.pointer];
21    }
22
23    forward() {
24        this.pointer = Math.min(this.history.length - 1, ++this.pointer);
25        return this.history[this.pointer];
26    }
27}
28
29// Driver code to test the BrowserHistory class
30const browserHistory = new BrowserHistory("https://algodaily.com");
31
32// Visiting new URLs
33browserHistory.visit("https://google.com");
34browserHistory.visit("https://facebook.com");
35
36// Navigating back and forth
37console.log(browserHistory.back());  // Should print "https://google.com"
38console.log(browserHistory.back());  // Should print "https://algodaily.com"
39console.log(browserHistory.forward());  // Should print "https://google.com"
40
41// Visiting a new URL from a past page
42browserHistory.visit("https://twitter.com");
43
44console.log(browserHistory.back());  // Should print "https://google.com"
45console.log(browserHistory.forward());  // Should print "https://twitter.com"