There are a few higher-order functions for collections that can be rather difficult to fully understand. While there are several good resources out there to learn the basics, it can still be confusing and seem a bit like magic. And when things seem like magic they tend to not get used effectively or maybe not at all.
In this post, I’m going to try explaining map, compactMap, flatMap, reduce and filter by walking through their inputs, outputs and deriving an implementation for each. For simplicity, we will focus on arrays but this can be expanded to most data structures. The goal is only learning the ideas, not to implement the best possible solution.Read More »
This is a very simple spotlight effect that can be used to show silhouettes. No shaders or blend modes, just a couple sprites. The way this effect works is that you make the foreground and background elements the same color and then simply add an element with contrasting color between them.