Swift coding convention

Swift_coding_convention_spacing.swift

//Preferred:
if user.isHappy {
  // Do something
} else {
  // Do something else
}

//Not Preferred:
if user.isHappy
{
  // Do something
}
else {
  // Do something else
}

//Use [:]
//Preferred:
class TestDatabase: Database {
  var data: [String: CGFloat] = ["A": 1.2, "B": 3.2]
}

//Not Preferred:
class TestDatabase : Database {
  var data :[String:CGFloat] = ["A" : 1.2, "B":3.2]
}