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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

Form validation is checking inputs like name, email, and password before submitting. We need to check that all the fields are correct and, according to that, submit the input to the server side. Good validation improves user experience and prevents invalid data. JavaScript Form Validation Form markup Here is the basic HTML structure I’m using. … Read more

Flattening means converting a nested array (an array inside arrays) into a single level array. If I have multiple levels like [1, 2, [3, 4], [[5, 6]]], dealing with it is difficult. I don’t want arrays inside arrays at different levels. I want everything at one single level like [1, 2, 3, 4, 5, 6]. … Read more

I’m going to show how to create a drop-down in JavaScript. I start with a basic HTML structure: a heading at the top, a main div whose class is drop-down, a button with the id drop-down-button that says “Click me,” and a div with the id and class drop-down-content. Inside this div there are three … Read more

We are going to learn how to chain three of the most useful methods of arrays in one single problem statement, that is your map, filter, and reduce, and this will transform your data in a clean and a very concise way. JavaScript Array Method Chaining: overview Your problem statement is that imagine you have … Read more

I am going to show how to create a custom event in JavaScript. First, we will create a button in the frontend. With that, we will attach that particular event. The button says Click me, and we will give it an id. Everything else is in the script. We will create a custom event. Then … Read more

Memoization is all about doing the caching. It is a way to store the result of an expensive function so that when we call the function with the same arguments again, we can return the same cached result without recomputing the whole function. This is very useful for heavy calculation and for recursive algorithms. A … Read more

I’m going to show how to show or hide elements with JavaScript. I’ll start with a basic HTML setup: a button that says “Show or Hide Text” and a paragraph that says “Hello, I can be hidden or shown.” I’ll give the paragraph an id – I’ll call it myText. I’ll create the function first, … Read more