Retroactive modeling is the practice of using existing types to represent new concepts, without modifying those types. This technique is important for reusing existing structures, while maintaining compatibility with the current usage. Swift supports retroactive modeling through the use of extensions. Extensions enable you to add new functionality to existing types, without the need to have access to the original source code. Swift extensions are similar to categories in Objective-C, and can be used to extend a class, struct, enum,… [continue]

Most, if not all, programming languages have a construct for defining reusable sets of instructions. In Swift that construct is a closure. A closure is a self-contained chunk of code that is used to perform a specific task. The most basic type of closure is a named closure, which is more commonly known as a function. Functions (Named Closures) Every function is defined using the func keyword followed by the function name. The function name should describe the task that… [continue]