Javascript Calculator (Node)

Bob Ziroll -

You are going to create a calculator in pure Javascript using NodeJS and readline-sync.

Your script must have:

  • A function that adds two numbers and returns the result
  • A function that multiplies two numbers and returns the result
  • A function that divides two numbers and returns the result
  • A function that subtracts two numbers and returns the result
  • Each function will have 2 parameters, num1, num2
  • On the console the prompt will print to the user:
  • Please enter your first number (store that number)
  • Please enter your second number (store that number)
  • Please enter the operation to perform: add, sub, mul, div (then store the operation)
  • Based on the operation entered by the user, you will call one of your 4 functions to perform the correct operation
  • You will then print to the console: The result is: [the result]

To get set up:

  • cd into the folder you'll be working in.
  • run npm install readline-sync
  • At the top of your JS file, include const readline = require("readline-sync")
  • For documentation on the readline-sync package, check out the readline-sync docs on npmjs.org

Tips:

Spend some time making sure you know the difference between a function call's "argument" and a function's "parameter".

You will have an if statement run a different function depending on what the user chooses on the third readline prompt.

A function can take values as arguments and a function will return a value. If you console log the function call, you can see that value.

console.log(add(3, 4))