[Swift] Swift Memo

• Default Value

b = a ?? "empty"
//equals
b = (a == nil ? "empty" : a!)

• Dictionary

var dic1 = [String:Any]()
//equals
var dic2 = Dictionary<String,Any>()

• Sort

var a = [10, 5, 2, 3, 1]

a.sort({x, y in x > y})
a.sort({$0 > $1})
sort(&a, {$0 > $1})

• Spilit string

let array = split(str!) { $0 == " " }