Prototype in JavaScript is a hidden feature that allows us to add new properties or methods to objects and share them across different instances. I will explain how it works and how to write the prototype in JavaScript. Every function in JavaScript has a special property called prototype. It is used to add methods and … Read more
If you have ever ended up with a pile of if-else statements, the switch statement in JavaScript is a great way to clean it up. A switch statement lets you compare one value against many possible cases and run the code for the first matching case. It is like a menu of conditions. If one … Read more
The JavaScript typeof operator is a very basic but very powerful operator. It helps you know what kind of data a variable is holding, and it is super useful for debugging and writing clean code in JavaScript. The typeof operator is used to check the data type of a value or a variable, and it … Read more
Checking if an array contains a specific value in JavaScript is a must-know concept for beginners and for coding interviews. Here I’ll explore two practical methods with clear examples and simple explanations: .includes() and .indexOf(). If arrays and loops are new to you, see loops, arrays. Suppose we have an array like apple, apple, banana, … Read more
I’m going to learn how to find the maximum and minimum values in an array using different methods in JavaScript. I will cover the Math.max method and the Math.min method, the spread operator with example and explanation, which will be perfect for the beginner and for your interview preparation. If you often pair arrays with … Read more
Formatting numbers properly in JavaScript comes up all the time with prices, scores, or measurements. I use two methods constantly: toFixed and parseFloat. I’ll show how to round numbers, format to a specific number of decimals, and safely convert a formatted string back to a number. If you’re brushing up on core flow control too, … Read more
We are going to learn how to parse JSON data in JavaScript. It is a must-know concept if you are working with APIs and storing data or just building modern apps. I will explain everything from scratch. Imagine someone sends you a letter in a code language and you need to decode it before you … Read more
We are going to learn how to build a simple timer using JavaScript like a stopwatch that counts seconds. It is a beginner-friendly project and it is useful in many different projects like quizzes, countdown, or a fitness app. If you also want a quick refresher on loops while practicing basic JS, see do-while. JavaScript … Read more
Rounding means changing a number to the nearest whole number in a specific direction like up or down. Whole numbers are 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, and so on from zero to infinity. If you are having 2.3 and you do the round off, it can be 2 or 3 … Read more
Deep cloning means creating a new object whose nested properties do not share references with the original. Nested properties still refer to the same memory with the spread operator, and that’s why we do a _deep clone_. Let me first show you what a _shallow copy_ is so you understand the need for _JavaScript Object … Read more