How to structure object in javascript -

how can structure object allow initialization same way stripe api:

var stripe = require("stripe")(   "sk_test_bqokikjovbii2hlwgh4olfq2" ); 

i have tried this

var example = (function () {     function example(api_token) {         this.token = api_token;     }     example.prototype.getself = function (callback) {         //do stuff     };     return example; }()); module.exports = example; 

but cannot set property 'token' of undefined error when calling var sdk = require('./example')(api_key);

since function isn't being called constructor (via new keyword), need make sure function provide doesn't expect called way.

you this:

function example(api_token) {     this.token = api_token; } // ...prototype, etc.  function example(api_token) {     return new example(api_token); } module.exports = example; 

or don't use constructor function @ all, , use object.create:

var exampleproto = {     getself: function() {        // ...     } }; function example(api_token) {     var o = object.create(exampleproto);     o.token = api_token;     return o; } module.exports = example;