Creating new closure scopes in Node.

module.js

module.exports = function () {
  var c = [];
  return {
    push: function (item) {
      c.push(item);
    },
    print: function () {
      console.log(c);
    }
  };
};

test.js

var a = require('./module')();
var b = require('./module')();

a.push('argle');
b.print(); // []
a.push('bargle');
a.print(); // ['argle', 'bargle']
b.print(); // []