How to create range in Swift?

Question

In Objective-c we create range by using NSRange

NSRange range;

So how to create range in Swift?

Answer 1

I created the following extension:

extension String {
    func substring(from from:Int, to:Int) -> String? {
        if from=0 && to

example of use:

print("abcde".substring(from: 1, to: 10)) //nil
print("abcde".substring(from: 2, to: 4))  //Optional("cd")
print("abcde".substring(from: 1, to: 0))  //nil
print("abcde".substring(from: 1, to: 1))  //nil
print("abcde".substring(from: -1, to: 1)) //nil