Build a Simple Calculator in React + JavaScript Foundations

Build a Simple Calculator in React + JavaScript Foundations

Build a Simple Calculator in React + JavaScript Foundations

Learn the Foundations of React and JavaScript by Building a Calculator. Includes JSX, Callbacks, Events, + More

Language: english

Note: 4.5/5 (32 notes) 13,068 students

Instructor(s): YouAccel Training

Last update: 2022-07-31

What you’ll learn

  • The purpose of ReactJS
  • Building a Simple React Web Page
  • The Tools Needed to work with React
  • Introduction to Codepen
  • Introduction to JSX, Functional Components, and React Props
  • Foundations of Callbacks, and OnClick Events
  • The React State Hook
  • Building the Calculator
  • Debugging in React
  • Document Object Model (DOM)
  • JavaScript Arithmetic Operators, Data Types, Arrays, Loops, Events
  • JavaScript Variables, Operator Precedence, Objects, Functions
  • JavaScript Foundations



  • Basic Knowledge of HTML and CSS
  • Basic Computer Skills



This course takes you step-by-step through the process of building a fully functional calculator in React. React, also known as React JS, is a powerful JavaScript library used for building custom, interactive user interfaces using UI components. Some of the most well known examples of organizations using React for their front-end include Netflix, Facebook, and Airbnb. Developed and maintained by Meta along with a community of independent developers, React remains free and open-source. React is a component based library built entirely on JavaScript, which makes it perfect for designing complex UI’s. With React, developers can build encapsulated components that efficiently manage their own state and render UI updates specifically when data changes. For example, think of the automated content refresh feature you see on a twitter feed, or facebook like button. Here the state of the UI component changes on the page, without having to manually refresh when the data is updated. This is just one small, yet powerful feature of React.

Through a complete hands-on project, this course will teach you all the fundamental principles of React that you must know to become a proficient React developer. We start right from the basics, including the tools needed to get started. From there we dive into JSX, functional components, props, callbacks, and various OnClick events. By this stage, the calculator will have a complete visual display, coupled with functional arithmetic operations. Students then move on to passing parameters in Callback functions, using the React State Hook, and debugging.

In addition to the hands-on React module, we also offer a comprehensive overview of JavaScript for those who need a refresher. Here we start with introducing students to the document object model (DOM) which defines the logical structure of HTML documents. From there we dive into JavaScript to demonstrate various methods in which DOM elements can be manipulated to add interactivity to static components. We start right from the basics, which includes JavaScript placement, and data output. From there we move on to variable declaration, arithmetic operations, operator precedence, data types, and objects. Once the foundations are covered, we move on to more complex operations using Arrays, Conditional Statements, JavaScript comparison operators, booleans and loops. Here students will learn to unleash the true power of JavaScript to render different outcomes based on user interaction. We will explore the use of functions to efficiently handle repetitive tasks and JavaScript events to handle output based on actions and occurrences. The section will conclude with a hands-on project where students will implement their knowledge to build a web based photo gallery and background color changer.

As you can see this course covers a tremendous bit of ground. Best of all it features Tim Maclachlan – a renowned senior full-stack developer with over 20 years of commercial development experience. As a multi-faceted developer, Tim specializes in algorithmic, analytical and mobile development. To date, he’s written hundreds of applications and worked in a number of industries from commercial aviation and military, to banking and finance. Tim has a genuine passion for teaching others how to become better coders and looks forward to interacting with his students.

With that said, we hope you’re just as excited about this course as we are, if so – hit that enroll button and let’s get started.


Who this course is for

  • Students interested in learning how to build interactive web pages using JavaScript
  • Students interested in learning ReactJS
  • Students interested in front-end UI Development using React
  • Students interested in learning JavaScript Foundations


Course content

  • The Document Object Model (DOM)
    • DOM Introduction
    • DOM Manipulation
  • JavaScript Development
    • Introduction
    • JS Placement
    • External JavaScript
    • JavaScript Output
    • JavaScript InnerHTML
    • JavaScript Commenting
    • JavaScript Constants
    • JavaScript Variables Introduction
    • JavaScript Assignment Operator
    • JavaScript Arithmetic Operations
    • JavaScript Arithmetic Operations Continued
    • JavaScript Operator Precedence
    • JavaScript Data Types
    • JavaScript Objects
    • JavaScript Object Output
    • JavaScript Strings
    • JavaScript String Length
    • JavaScript Special Characters
    • JavaScript Random Numbers
    • JavaScript Min and Max Function
    • JavaScript Math Round Function
    • JavaScript Arrays
    • JavaScript Array Attributes
    • JavaScript Arrays – Pop – Push – Shift – Unshift
    • JavaScript Changing and Deleting Elements
    • JavaScript Splicing an Array
    • JavaScript Sorting an Array
    • JavaScript Joining Arrays
    • JavaScript Conditional Statements
    • JavaScript Comparisons
    • JavaScript Booleans
    • JavaScript For Loops
    • JavaScript For-In Loop
    • JavaScript While Loops
    • JavaScript Do-While Loop
    • JavaScript Break and Continue
    • JavaScript Functions
    • JavaScript Events
    • JavaScript Project 1 – BG Color Changer
    • JavaScript Project 2 – Photo Gallery
    • JavaScript Project 2 – Completion
  • Introduction
    • Skills Required
    • What is React?
  • Project: Build a Calculator in React
    • Project Overview
    • Hello React
    • Tools Needed
    • Code Pen
    • Intro to JSX
    • Functional Components in React
    • Why Components?
    • Intro to Props in React
    • React Components, Props and Callbacks
    • Building the calculator visuals
    • OnClick Events in React
    • Passing Parameters in Callback Functions
    • Using React State Hook
    • Implementing the calculator – Display
    • Implementing the calculator – Operators
    • Debugging in React
    • Project Summary


Build a Simple Calculator in React + JavaScript FoundationsBuild a Simple Calculator in React + JavaScript Foundations

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