Here we learn how to check if a value is defined or null in JavaScript, and how equality works with these values. JavaScript Null vs Undefined Definitions What is undefined? The undefined is a variable that is declared but not assigned any value yet. It means you declare a variable but you have … Read more
I’m going to show you how to capitalize the first letter in JavaScript. JavaScript does not have a built-in method to capitalize just the first letter, but we can create our own logic to convert the first letter to capital. Let’s understand the concept step by step. Why JavaScript Capitalize First Letter Since … Read more
We are going to learn how to use _break_ and _continue_ in loops. _break_ is used to exit the loop and _continue_ is used to skip the current iteration. We will implement it in JavaScript step by step. JavaScript Break and Continue Basic loop I want to get all the numbers from 0 to 9. … Read more
I am going to show how to format strings with template literals using the back tick and the dollar sign. It is a very easy and efficient method. The basic syntax is that you use the back tick (below your Escape key) and you use the dollar sign with curly braces like ${} to insert … Read more
Generating random numbers in JavaScript is straightforward. For generating random numbers, we use the random function which is given by JavaScript, which gives a value between 0 and 1. From the Math library we are calling this random function, and by this a random number will be generated and that particular number will be between … Read more
The map method is one of the most powerful functions for working with arrays. It helps to quickly transform data in JavaScript in a very smart and very clean way. It is used to create a new array by applying a particular function on each and every element of the original array. The map does … Read more
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