//
//  String.swift
//  app
//
//  Created by Iñigo Valentin on 2/1/17.
//  Copyright © 2017 Margolariak. All rights reserved.
//

import Foundation

extension String {
	var length:Int {
		return self.characters.count
	}
	
	func indexOf(target: String) -> Int? {
		
		let range = (self as NSString).range(of: target)
		
		guard range.toRange() != nil else {
			return nil
		}
		
		return range.location
		
	}
	func lastIndexOf(target: String) -> Int? {
		
		
		
		let range = (self as NSString).range(of: target, options: NSString.CompareOptions.backwards)
		
		guard range.toRange() != nil else {
			return nil
		}
		
		return self.length - range.location - 1
		
	}
	func contains(s: String) -> Bool {
		return (self.range(of: s) != nil) ? true : false
	}
	
	func subStr(start: Int, end: Int) -> String{
		
		let st = self.index(self.startIndex, offsetBy: start)
		var ed = self.index(self.startIndex, offsetBy: end)
		
		let range = st...ed
		return self[range]
	}
}