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Category: Learning

Creating a Number Class

In this tutorial I will show you how to create a Number class that can tell you when its value has been actually set, along with other methods to manage how it is used while demonstrating some common object-oriented techniques and features such as operator overloading. You’ll be able to create a Number from an Integer, Double or String.

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Filtering the Debugger

Starting with Xojo 2023r1 you’ll find a new feature in Xojo’s Debugger panel that allows you to filter the objects and variables displayed, even between different project runs! This lets you stay focused on the more important objects and variables instead of scrolling through the list of all entries.

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Matrix Math

A feature in some other languages you may have seen is something called matrix math. These are operations you can perform on matrices, which are 2-dimensional arrays. Xojo does not have any matrix math functions built in, but using the Extends command you can add your own.

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Testing REST-based Web Services

Using Xojo’s URLConnection to communicate with web services is pretty straightforward. But testing the actual REST API calls can get tricky. To make it easier to test and experiment with REST API calls, Paul created an app in Xojo for doing just this. He called it RESTy in its original format back in 2015. The most recent version of the example project can be found in Xojo by choosing File > New Project, clicking on Examples then clicking on Communication > Internet > Web Services >RESTy.

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Algorithm: Equally Spaced Ranges

There are some situations where you may need a range of numbers that is equally spaced. For example, when given a minimum and a maximum value within which a set of numbers that need to be equally spaced. This is useful if you are designing an UI control displaying “ticks” or for the axis of a graphic chart displaying cartesian values. Continue reading to see a technique to do just this.

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