The difference between value and reference in JavaScript — The concept of value vs reference in JavaScript is so important yet can be confusing at times. If we don’t understand the difference between value and reference, it can introduce many bugs in our JavaScript code. In this article, I will discuss in detail what value vs reference is in…

Python implementation of DFS graph search algorithm — Breadth-First Search (BFS) and Depth-First Search (DFS) are two of the most fundamental graph traversal techniques to learn. In a previous article I discussed how we can code the BFS algorithm using Python: Breadth-First Search (BFS) Algorithm With Python Understanding of BFS graph search algorithm with Python implementation.medium.com In continuation to that, today I’ll write about how to implement the DFS algorithm in Python. First…

A JavaScript app to solve sudoku puzzles using backtracking — Sudoku is a popular puzzle game. Humans take different approaches when solving a sudoku puzzle. But if you want a computer to solve a sudoku you have to tell a specific rule for it to follow. Backtracking is that specific technique. If you studied Algorithms and Data Structures, you may…

How to solve the valid parentheses (balanced brackets) problem using the stack data structure — When writing an expression containing brackets, we make sure the ordering of the brackets is right, and an opening bracket always ends with the same type of closing bracket. See the mathematical expression below: ((3x + 4y) * (5x + 7y)) + (2x + y) If we remove all characters…

How to write anonymous functions in Python using the lambda expression — Anonymous functions in Python roughly means functions with no name. We can write an anonymous function in Python using the lambda keyword. That’s why in Python anonymous functions are also known as lambda functions or lambda expressions. Today we will discuss Python lambda functions and learn how to use them…

Understanding of BFS graph search algorithm with Python implementation. — In Computer Science, traversing or searching a graph means visiting or processing each node of the graph. There are various algorithms for graph traversal. Breadth-first search is one of them. It is one of the most fundamental graph search techniques. In this article, we will dive into the basics of…

Python representation of graph. — Graph is an important data structure studied in Computer Science. Graph theory is an equally important topic in both mathematics and Computer Science. Representing a graph in a program means finding a way to store the graph in a computer’s memory. …

Split Data Into Several Pages in Django Using the Paginator Class — Using the Paginator class in Django we can split a QuerySet into Page objects. This way we can split data across several pages with the “previous/next” page link. In this article, I will discuss the basics of the Paginator class and how to apply pagination in Django with a function-based…

How to rearrange the words of a string in reverse order without reversing the individual words — The Problem Given a string S, we need to reverse it without reversing the individual words in the string. Words are separated by white spaces. So, if we have a string: S = “reverse the string” Simply reversing the string would give us the following output: Output: “gnirts eht esrever” But our…