iOS

Closures are similar to lambdas in Python or Ruby. They are self contained chunks of code. Global and nested functions are closures, but are often not »

Intro Optionals are needed because swift disallows nil values in all other types aside from Optionals. This characteristic of not allowing nil values is not present »

Protocols and extensions are both tools swift uses to package modules of functionality that expand upon classes, enums and structs. Protocols can be shared across classes, »

Anatomy func functionName (parameterName: parameterType) -> returnType { statements to execute return object } External & Local Parameter Names Parameters can have two names in the function »

Array Initializing Arrays Initializer syntax - explicitly using the constructor var numbers = Array<Double>() var moreNumbers = [Double]() Literal syntax var differentNumbers = [90.0, 70. »