⏱ 0:00est. 5 min

Browser History Bloomberg

// https://leetcode.com/problems/design-browser-history/discuss/938860/JavaScript-clean-solution
/**
 * @param {string} homepage
 */
var BrowserHistory = function(homepage) {
    
    this.history = [homepage];
    this.currentIdx = 0;
  };
  
  /** 
   * @param {string} url
   * @return {void}
   */
  BrowserHistory.prototype.visit = function(url) {
    
    this.history.splice(this.currentIdx+1);
    this.history.push(url);
    this.currentIdx = this.history.length-1;
  };
  
  /** 
   * @param {number} steps
   * @return {string}
   */
  BrowserHistory.prototype.back = function(steps) {    
    this.currentIdx -= steps;   
    if(this.currentIdx < 0)  
      this.currentIdx = 0;  
    return this.history[this.currentIdx]
        
  };
  
  /** 
   * @param {number} steps
   * @return {string}
   */
  BrowserHistory.prototype.forward = function(steps) {
    this.currentIdx += steps
    if(this.currentIdx > this.history.length-1)
      this.currentIdx = this.history.length-1
    return this.history[this.currentIdx]
  };
  
  /** 
   * Your BrowserHistory object will be instantiated and called as such:
   * var obj = new BrowserHistory(homepage)
   * obj.visit(url)
   * var param_2 = obj.back(steps)
   * var param_3 = obj.forward(steps)
   */