Example of a simple calculator in js

calc.js

'use strict'

var args = process.argv.slice(2);
var result = null;

if(args.length == 3){
	var num1 = parseFloat(args[0]);
	var operation = args[1];
	var num2 = parseFloat(args[2]);	

	switch(operation){
		case "+":
			result = parseFloat(num1+num2);
			break;
		case "-":
			result = parseFloat(num1-num2);
			break;
		case "*":
			result = parseFloat(num1*num2);
			break;
		case "/":
			result = parseFloat(num1/num2);
			break;			
	}
}

console.log(result);