Command Line Argument Based Calculator in Node.js

Maximum Marks - 12

Create a command line argument based calculator using Node.js that takes in mathematical operations and numbers as arguments from the terminal and provides the appropriate output. The calculator should support the following operations (command for the particular operation are given in "()" , use those commands only ):

able to submit the app - 1 mark ( minimum score )
addition ( add ) - 1 mark
subtraction ( sub ) - 1 mark
multiplication ( mult ) - 1 mark
division ( divide ) - 1 mark
sine ( sin ) - 1 mark
cosine ( cos ) - 1 mark
tangent ( tan ) - 1 mark
random number generation ( random ) - 3 mark
random number generation error message ( random ) - 1 mark

The code should use the built-in crypto module to generate random numbers, and should also have the capability to take in an additional argument for determining the length of the generated random number (in the random operation if the length is not provided it should show the "Provide length for random number generation." message (without cote) ).

Hint: can use "crypto.randomBytes" function and convert to ".toString("binary")"

For example, running the command node index.js add 1 2 should return 3 and running the command node index.js random should give the message node index.js random 15 should generate a random number of the given length (ok not to show in a proper intiger format).

Your solution should be well-organized and easy to understand, with clear and concise comments explaining the logic behind each step.

Installation

you can use any node version that works for you ( 14+ )
please make sure you do not push package-lock.json

npm install

// complete functions on index.js

// test locally
npm run test

Requirements

The code should be written in Node.js
Use process.argv property to retrieve the command line arguments passed to the script
Use a switch statement or if-else statement to check the first argument (operation) and perform the appropriate calculation based on the remaining arguments
Use the built-in crypto module and its "randomBytes()" method to generate a random number of the desired length (if provided as an argument)
Use console.log() to output the result of the calculation
Handle cases where the wrong number of arguments or invalid operations are passed
Add comments throughout your code to explain the logic behind each step

Evaluation Criteria

Correct implementation of the mathematical operations
Proper handling of command line arguments
Proper implementation of random number generation
Proper handling of edge cases
Code readability and organization
Comments explaining the logic behind each step

General guidelines