Create a gist now

Instantly share code, notes, and snippets.

What would you like to do?
Adding the subtract feature: Git: Node Pre-commit Hooks blog post
/*
* File : calc.js
* Description : A calculator node command line interface app.
* ------------------------------------------------------------------------------------------------ */
var argv = require('minimist')(process.argv.slice(2));
/**
* Sum two numbers together
* @param {number} num1
* @param {number} num2
* @returns {number}
*/
function sum(num1, num2) {
return num1 + num2;
}
/**
* Subtracts one number from the other.
* @param {number} num1
* @param {number} num2
* @returns {number}
*/
function subtract(num1, num2) {
return num1 - num2;
}
var num1 = argv._[0];
var operator = argv._[1];
var num2 = argv._[2];
if (isNaN(num1) || isNaN(num2)) {
throw 'Arguments must be valid numbers';
}
if (['+', '-'].indexOf(operator) < 0) {
throw 'Invalid operator';
}
var result;
switch(operator) {
case '+':
result = sum(num1, num2);
break;
case '-':
result = subtract(num1, num2);
break;
}
console.log(result);
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment