Merge pull request #108 from mrnazu/mrnazu

Mrnazu - NodeJS Calculator Implementation

Author: dohoudaniel

mrnazu/README.md

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+# CLI based NodeJS Calculator
+
+## Overview
+
+This implementation utilizes the `process` object, specifically its `arguments` property, to capture command line inputs. The script then processes the arguments, performing various operations based on user input.
+
+## Functionalities
+
+In this example application, users can perform basic arithmetic operations by providing command line arguments. The supported operations include addition, subtraction, multiplication, and division.
+
+- To add two numbers:
+  ```
+  node app.js add num1 num2
+  ```
+
+- To subtract two numbers:
+  ```
+  node app.js subtract num1 num2
+  ```
+
+- To multiply two numbers:
+  ```
+  node app.js multiply num1 num2
+  ```
+
+- To divide two numbers:
+  ```
+  node app.js divide num1 num2
+  ```
+
+## Implementation
+
+### Step 1: Set Up Your Project
+
+Create and open your project folder in a code editor.
+
+### Step 2: Create 'app.js'
+
+Inside this file, write the code for command line arithmetic operations.
+
+### Step 3: Process Command Line Arguments
+
+```javascript
+const argvs = process.argv;
+const argv = argvs.slice(2);
+```
+
+### Step 4: Assign Arguments to Constants
+
+```javascript
+const operation = argv[0];
+const operator1 = parseInt(argv[1]);
+const operator2 = parseInt(argv[2]);
+```
+
+### Step 5: Perform Operations
+
+```javascript
+if (operation === 'add') {
+   console.log(`${operation} is ${operator1 + operator2}`);
+}
+
+if (operation === 'subtract') {
+   console.log(`${operation} is ${operator1 - operator2}`);
+}
+
+if (operation === 'multiply') {
+   console.log(`${operation} is ${operator1 * operator2}`);
+}
+
+if (operation === 'divide') {
+   console.log(`${operation} is ${operator1 / operator2}`);
+}
+```
+
+Now, users can run the script with appropriate command line arguments to perform desired arithmetic operations.
+
+---
+
+Feel free to contact me on [X formerly Twitter](https://twitter.com/mrnazu_)

mrnazu/app.js

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+// Get command line arguments using the process object
+const argvs = process.argv;
+
+// Extract relevant command line arguments, excluding 'node' and script file name in my case 'app.js'
+const argv = argvs.slice(2);
+
+// Extract the operation (add, subtract, multiply, divide) from command line arguments
+const operation = argv[0];
+
+// Parse the second and third command line arguments as integers
+const operator1 = parseInt(argv[1]);
+const operator2 = parseInt(argv[2]);
+
+// Check if the operation is addition
+if (operation === 'add') {
+    // Print the result of addition to the console
+    console.log(`${operation} is ${operator1 + operator2}`);
+}
+
+// Check if the operation is subtraction
+if (operation === 'subtract') {
+    // Print the result of subtraction to the console in anotehr way
+    console.log(`Subtraction of these numbers: ${operator1 - operator2}`);
+}
+
+// Check if the operation is multiplication
+if (operation === 'multiply') {
+    // Print the result of multiplication to the console
+    console.log(`${operation} is ${operator1 * operator2}`);
+}
+
+// Check if the operation is division
+if (operation === 'divide') {
+    // Print the result of division to the console
+    console.log(`${operation} is ${operator1 / operator2}`);
+}