Task - Build a Home Sweet Home Theater. That's a hell lot of classes and their interactions. Below is the way to watch a movie the hard way. Turn on the popcorn popperpopper.on(); Start the popper poppingpopper.pop(); Dim the lightslights.di...
Why Adapter Pattern Solution Class Diagram Object and Class adapter Above class diagram is for object adapter, below is class adapter. Object uses composition, class uses subclassing. Let's take a example of Enumeration and Iterator. Task is to...
Task - We have to design an API for remote control for Home automation. Reference example - a waitress in restaurant. Now we have to place a device in empty slots and press button whichever you want. Let's see what are the vendor devices Now looks...
Why Singleton Pattern Singleton pattern also gives us a global point of access, just like global variables, but without initializing the object beforehand, a global variable gets created when your application starts which is a downside. How to rest...
Task - Design beverage shop with multiple toppings on it. Initially the shop was not offering the toppings only a specific beverage.So design would look like this. So you they have expanded and started offering the toppings as well, in similar way w...
Let's Understand the Observer Pattern with the help of completing the below task. Task - Weather-O-Rama [Internet-based Weather Monitoring Station] Requirements - An application that initially provides three display elements Current condition Weat...
Problem statement Find two numbers in a sorted non-decreasing order 1-indexed array that adds up to the target. Return their indices (1-indexed) as [index1, index2] in an integer array of length 2. The solution should use constant extra space. Constr...
Problem statement Given an array of integer nums and an integer k, return the number of unique k-diff pairs in the array. A k-diff pair is an integer pair (nums[i], nums[j]), where the following is true: 0 <= i, j < nums.length i != j |nums[i] - n...
Problem statement Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it can trap after raining Constraints n == height.length 1 <= n <= 2 * 10<sup>4</sup> 0 <= height[i] <= 10<sup>5...