Node.js Calculator with History

A clean, responsive web calculator built with Node.js, Express, and Vanilla JavaScript. This project features a dynamic history tracking system that clears itself on command.

Features

• Real-time Calculations: Powered by JavaScript's math engine.
• Smart History: Tracks your last 5 calculations.
• Conditional UI: The "Delete History" button only appears when there is at least 1 entry (Logic: 1=1 clear history).
• Responsive Design: Works on desktop and mobile browsers.

Getting Started

Prerequisites

• Node.js (v14 or higher)

Installation

1. Clone the repository:

   git clone [https://github.com/your-username/node-calc.git](https://github.com/your-username/node-calc.git)

2. Install dependencies:

   npm install
   

3. Start the server:

   npm run dev
   

4. Open your browser to http://localhost:3000

Tech Stack

The following technologies, languages and frameworks were used throughout the creation of this program:

• Backend: Node.js, Express
• Frontend: HTML5, CSS3, JavaScript (ES6+)

Logic Highlight

The history visibility is controlled by a state-check in script.js:

function renderHistory() {
    clearHistoryBtn.style.display = (history.length >= 1) ? "block" : "none";
}

Encoding

This project uses UTF-8 encoding throughout.

• Line endings are enforced as LF via .gitattributes
• PowerShell output/input is expected to be UTF-8
• Emojis and Unicode characters are supported

PowerShell (Windows)

If emojis do not render correctly, ensure UTF-8 is enabled:

[Console]::InputEncoding  = [System.Text.Encoding]::UTF8
[Console]::OutputEncoding = [System.Text.Encoding]::UTF8
chcp 65001

You should see:

modified: README.md