Searching for patterns in text is a common task you'll encounter in your programming travels. Swift provides a power type called Regex to perform that task. Using standard syntax, you can express complicated matching patterns to extract information from text. You can use an all-new regex builder syntax…

…value and decide what to do based on that value, and they’re incredibly powerful when used with some advanced Swift features such as pattern matching. Countable Ranges Before you dive into the for loop statement, you need to know about the Countable Range data types that let you represent…

…school year" } } Also, recall that switch statements must be exhaustive with their cases. The compiler will warn you if they aren’t. When case patterns are String elements, you need a default case because it’s impossible to create cases to match every possible String value. However, enumerations have…

…circle.circumference // 31.42 // also, pi now has a value Since you’ve got eagle eyes, you’ve noticed that pi uses a { }() self-executing closure pattern to calculate its value, even though it’s a stored property. The trailing parentheses execute the code inside the closure curly braces immediately. But since…