Fucking substring Swift 3

FuckingSubstringSwift3.md

1 - Create a extensions for String with a new, wonderfull, superpower method called crop:

extension String {
    func crop(from: Int, length: Int) -> String! {
        let startIndex = self.index(self.startIndex, offsetBy: from)
        
        var result = self.substring(from: startIndex)
        
        let endIndex = result.index(result.startIndex, offsetBy: length)
        result = result.substring(to: endIndex)
        
        return result
    }
}

Now you can rest in peace:

var str = "12345678901"

var result = str.crop(from: 6, length: 3)
// results in "789"

Oh, many thanks. This is real helpful.

Found this gist using search phrase in google: "FUCKING SWIFT HOW TO SUBSTRING STRING"