extension String{
func subString(from fromIndex: Int, to toIndex: Int) -> String{
var halfString = self.substringWithRange(Range<String.Index>(start: advance(self.startIndex, fromIndex), end: advance(self.startIndex, toIndex)))
return halfString
}
func subString(from location: Int, length strLength: Int) -> String{
let nsForm = self as NSString
return nsForm.substringWithRange(NSRange(location: location, length: strLength))
}
}
var testStr = "Hello World"
var helloStr = testStr.subString(from: 0, length: 5) //"hello"
var helloStr1 = testStr.subString(from: 0, to: 5) //"hello"
