The ~= operator

Swift

Use the ~= operator in Swift to check for patterns. Say you have an array and you want to get an object at index in a safe way

var index = 1
var tribes = ["BOWSER", "WM", "Ragnarök"]

// You can replace this:
// if index >= 0 && index < tribes.count {
//    print(tribes[index])
// }

// With this
if 0..<tribes.count ~= index {
    print(tribes[index])
}