Javascript

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

We will see what debouncing is and how we can implement it using a real world example like handling a resize event on the browser window. I have written a sort of example here in which we are having a function named reportNewWidth, and whenever this function gets called it will print a line showing … Read more

I am going to create a button which can copy the text from the website. I have a basic HTML setup with a paragraph that contains some text and an id, and a button with the label “Copy text”. When I click the button, I want the functionality that this particular text gets copied. JavaScript … Read more

Here is a small project to understand how to disable a button after a click using JavaScript. When the form gets submitted we want to disable the button so the user cannot just randomly click it again and again. We will also show a message in a paragraph element and change the button text after … Read more

We will learn how to create a shallow copy of an object in JavaScript. A basic but powerful technique every developer should know. A JavaScript shallow copy copies only the first level of properties in an object. Nested objects or arrays are not cloned – they are still referenced from the original. This is useful … Read more

I am going to show how to generate a list from an array dynamically with the help of JavaScript. We will create a simple unordered list in HTML, then populate it from a JavaScript array using forEach, document.createElement, and appendChild. Setup HTML for JavaScript Array to List     Create a starting HTML file and … Read more