Build a Basic Calculator with JavaScript - A Step-by-Step Guide

Step 1: Set Up the HTML Structure -  Create an HTML file with the necessary structure, including buttons for numbers and operators, an input field for display, and a <script> section for JavaScript code.

Step 2: Create JavaScript Functions - Inside the <script> section, define JavaScript functions for the calculator's basic operations, including initializing the display, appending values, clearing the display, and calculating results.

Step 3: Style Your Calculator (CSS) - Add CSS styles to make your calculator visually appealing. Define styles for the calculator container, buttons, and display area.

Step 4: Add Additional Buttons -  Add more buttons for numbers and operators if needed. Adjust the appendToDisplay() function calls for each button accordingly.

Step 5: Test Your Calculator -  Test your calculator in a web browser to ensure it works as expected. Make any necessary adjustments to the code and styles.

That's it! You now have a simple calculator created using HTML, JavaScript, and CSS.

Source Code - _Codepen