[Node.js] Exporting Modules in Node

// circle.js using the exports statement
var PI = Math.PI;

exports.area = function(r){
  return PI * r * r;
}

exports.circumference = function(r){
  return 2 * Pi * r;
}

// accessing the exported functions in the node shell
var circle = require(‘./circle.js‘);

circle.area(4);
circle.circumference(4);

// using module.exports to demonstrate the same functionality
var PI = Math.PI;

module.exports = function(r){
  return {
    area: function(){
      return PI * r * r;
    },
    circumference: function(){
      return 2 * PI * r;
    }
  }
}

// accessing the exposed functions in the node shell
var circle = require(‘./circle.js‘);

var myCircle = circle(4);

myCircle.area();
myCircle.circumference();