How do we return function using module.exports in nodeJS?

Question

How do we return function using module.exports in nodeJS?

file_1 book.js

  module.exports = function() {
    var points = 0;
    return {
        rate: function(value) {
            points = value;
        },
        get: function() {
            return points;
        }
    }
}

book.js is root file. We create two different instances but can not get the methods of root to script.js file.

file_2 main.js

  var bA = require('./book.js');
  var bB = require('./book.js');
  bB.rate(10);
  bB.get();

Output => can not find rate and get method.

Answer 1

Because the function returns an object with references to the rate and get functions, you need to execute it with a () on require like so:

  var book = require('./book.js')();
  book.rate(10);
  book.get();