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
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 … Read more