Calculator

Calculator example made w/ pure HTML + CSS + JS + JSDoc

Summary

The code snippet is a JavaScript code that handles the functionality of a calculator on a webpage.

It includes event handlers for keyboard input and button clicks, as well as functions to update the display and perform calculations.

Code Analysis

Inputs

• Keyboard events triggered by pressing keys on the keyboard.
• Button click events triggered by clicking on calculator buttons.

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Flow

1. The code initializes the calculator by getting references to the calculator element, display element, and key buttons.
2. It adds an event listener for keyboard input to the calculator element, which triggers the btnKeyEvent function.
3. It adds event listeners for button clicks to each key button, which triggers the btnCommonEvent function.
4. When a key is pressed on the keyboard, the btnKeyEvent function is called.
5. The btnKeyEvent function handles specific key events, such as backspace and delete keys, and triggers click events on the corresponding button elements.
6. When a button is clicked, the btnCommonEvent function is called.
7. Function btnCommonEvent updates the display based on the clicked button, taking into account the current state of the calculator.
8. The code snippet adds event listeners to specific buttons(zero, decimal, AC, CE, negate), which trigger their respective functions when clicked.
9. The functions update the display and perform calculations based on the clicked button.

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Outputs

• Updates the display element with the entered digits or operations.
• Performs calculations based on the entered digits and operations.

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https://github.com/GoToLoop/Calculator

https://GoToLoop.GitHub.io/Calculator

https://bpa.st/VKXA