Create A Complex Calculator App Using Ionic Framework

If you’ve been keeping up, I previously wrote two tutorials on the topic of evaluating mathematical expressions. The first tutorial was on the topic of converting an Infix expression into a Postfix expression also known as Reverse Polish Notation using the Shunting Yard algorithm. The second tutorial was on the topic of solving the Postfix expression.

Using the hybrid application framework, Ionic Framework, we’re going to create a calculator application for solving these complex expressions. Think of it as a mobile front end for the nice algorithms we made.

Parse An XML Response With Java And Dom4J

Previously we’ve explored how to parse XML data using Node.js as well as PHP. Continuing on the trend of parsing data using various programming languages, this time we’re going to take a look at parsing XML data using the dom4j library with Java.

Now dom4j, is not the only way to parse XML data in Java. There are many other ways including using the SAX parser. Everyone will have their own opinions on which of the many to use.

Evaluate A Reverse Polish Notation Equation With JavaScript

Previously, I demonstrated how to convert an Infix Notation expression into Reverse Polish Notation using JavaScript, but I never explained how to evaluate the expression.

Reverse Polish Notation via Wikipedia:

A mathematical notation in which every operator follows all of its operands, in contrast to Polish notation, which puts the operator in the prefix position. It is also known as postfix notation and is parenthesis-free as long as operator arities are fixed.

In this phase two article, we’re going to look at how to solve a mathematical expression that has been parsed into Reverse Polish Notation (RPN).

Make An AngularJS Library For The Imgur REST API

Imgur is a great image service for sharing and viewing images across the internet.

Since there is a lot of buzz around AngularJS lately and there isn’t already an AngularJS extension for the Imgur REST API, I decided to take it upon myself and start creating one.

Using Oauth 2.0 In Your Web Browser With AngularJS

I have a few popular Oauth related posts on my blog. I have one pertaining to Oauth 1.0a, and I have one on the topic of Oauth 2.0 for use in mobile application development. However, I get a lot of requests to show how to accomplish an Oauth 2.0 connection in a web browser using only JavaScript and AngularJS.

We’re going to better explore the process flow behind Oauth 2.0 to establish a secure connection with a provider of our choice. In this particular example we’ll be using Imgur because I personally think it is a great service.

Print Data To Paper Or PDF Using Ionic Framework

Have you ever built an app that has heavy content that might need to one day be printed to a PDF or to paper? Maybe you’re building the next great email or news app, both of which have an expectation that you should be able to print what you’re reading.

Both iOS and Android have printing functionality. We are using Ionic Framework, and lucky for us, printing to either of these platforms couldn’t be easier when we use the Apache Cordova Printer Plugin by Sebastian Katzer.

Sign Into Firebase With Facebook Using Ionic Framework

To continue on my trend of Firebase and Ionic Framework based tutorials, I thought, wouldn’t it be cool to sign into your Firebase application using a social media account such as Facebook?

Out of the box Firebase and AngularFire offer some nifty methods for authentication, however they don’t work quite as expected when it comes to mobile hybrid applications and I’ll explain why.