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HTML/CSSJavaScriptOOP

Analog Clock in JavaScript

Discover how to create an analog clock using HTML, CSS, and vanilla JavaScript, all centered around an object-oriented design.

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Easy
58 mins
8 chapters

Technologies/concepts covered

  • CSS transformations
  • Object-oriented programming
  • The DOM and Event APIs
  • JavaScript timers

Overview

In this project, we aim to replicate the behavior of a classic analog clock, depicting the current time, with hours, minutes, and seconds hands — something which we are all quite familiar with.

Basing its entire thinking and design over an OOP foundation, the project will help us acquire the necessary skills of abstraction in terms of objects and defining their relationships with one another.

Building an analog clock is easy enough to be one's first project in JavaScript while at the same time challenging enough to get us to build some solid amount of thinking and problem-solving skills. Being able to build applications that have interactions with the DOM is yet another common and crucial skill for a web developer, and this project gets us to exercise all of these indispensable these skills.

Learning outcomes

By the end of this project, you'll know how to:

  • Approach the construction of the HTML markup for a given program, efficiently and effectively.
  • Write JavaScript code in the object-oriented programming paradigm.
  • Use JavaScript's Date interface and setInterval() function — in our case to power the clock's ticking.
  • Think of programs in an extensible way so that it is easy enough to add new features later on.

Table of contents

  1. In this module, we understand the requirements of the project and what exactly do we need to replicate in making an analog clock in JavaScript.

  2. As per the name, this module is dedicated to getting done with 'designing' the clock, both in terms of its markup and its styles.

  3. Here we get down to the real business — bringing the clock to life by programming it using JavaScript around an object-oriented design.

  4. Get a birds-eye view of what we learnt in this project, and what could be done additionally to add more bells and whistles to it.

Let's get building!

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