Check if string is palindrome in objective c

Question

I\'m trying to check if a string is palindrome or not using objective c. I\'m new to programming without any experience in other programming languages so bear with me please

Answer 1

Recursive

- (BOOL)isPaliRec:(NSString*)str :(int)start :(int)end{
    if(start >= end)
       return YES;
    else if([str characterAtIndex:start] != [str characterAtIndex:end])
       return NO;
    else
       return [self isPaliRec:str :++start :--end];
}

Non Recursive

- (BOOL)isPali:(NSString*)str{
   for (int i=0; i

you can call:

NSString *str = @"arara";
[self isPaliRec:str :0 :(int)str.length-1];
[self isPali:str];

Swift 3:

// Recursive
func isPaliRec(str: String, start: Int = 0, end: Int = str.characters.count-1) -> Bool {
    if start >= end {
        return true
    } else if str[str.index(str.startIndex, offsetBy: start)] != str[str.index(str.startIndex, offsetBy: end)] {
        return false
    } else {
        return isPaliRec(str: str, start: start+1, end: end-1)
    }
}

// Non Recursive
func isPali(str: String) -> Bool {
    for i in 0..

Also, you can use swift 3 methods like a string extension... It's more elegant. extension sample