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]

Swift is designed to be safer than C-based programming languages. For example, Swift is a type safe language, that uses compile-time type checking to help catch errors early in the development process. And Swift uses type inference to enable the compiler to deduce types, requiring far fewer explicit type declarations. Another language feature that enhances safety is the optional. When you declare an instance in Swift, that instance must have a valid value for its type. If that instance can potentially be nil, then… [continue]