Array.map() is a synchronous operation and runs a function on each element in the array resulting in a new array with the updated items. There are situations where you want to run asynchronous functions within map, e.g. updating a list of models and push the changed information back …

We've tailored our 80+ tutorials on Retrofit to the Android platform. The snippets and examples are usually specifically written for Android apps. But that doesn't do Retrofit justice. Retrofit supports any regular Java project, not just on the Android platform. Even though you can implement the vast majority of our …

Developer tools are a minefield. We’re so picky about the tools we use and require a high quality or don’t even consider them. You have an ingrained workflow if you’re like me, you behave like a robot when starting your programming. Update — February 28th 2018 The code …

While running a website you’ll probably iterate on the design and functionality. Adding new pages is a good start to take a different path from your layout and apply new design ideas. At Future Studio, we’ve applied a different design to the galaxy map, compared to other pages. …

Developing your web app isn’t only about the happy path. You need to take care of proper error handling and that applies to more than just showing creative error messages for bad user inputs on forms. Update — February 28th 2018 The code samples of this tutorial are up to …

Actively maintained applications get started and stopped very often. It’s not like the operating system of your web server that doesn’t get touched for years once set up ;-) Especially during development, you’re usually starting a local instance of your app multiple times a day! Update — hapi …

We've already shown you in a previous tutorial how to upload files and how to upload multiple files to a server. In this tutorial, we'll show you a way of uploading multiple files with one request without knowing how many files it'll be. This is useful when the user can …

HTTP as a stateless protocol won’t keep the client’s state across different requests in your application. A common example for this scenario is the log-in and afterwards remember the user credentials for a defined time interval, like until the browser window gets closed. In case you don’t …