Swift crib sheet

let untyped = 3.14159265
print(type(of: untyped))                // Double
let lessPrecise: Float = Float(untyped)
print(lessPrecise)                      // 3.1415927
print(untyped == Double(lessPrecise))   // false

Copy

let item: String = "Oranges"
print(item.count)                       // 7
print(item.lowercased())                // "oranges"
print(item.uppercased())                // "ORANGES"

Copy