How to make a an array of mutable strings

Question

Im instantiating a mutable array, but it seems the elements become immutable so that I cant pass references to them to my function.

ERROR: "Cannot pass immutable value as inout argument: 'word' is a 'let' constant"

// MARK: - Properties

var wordsToTest = ["hannah", "bam"]

// MARK: -  Life cycle

override func viewDidLoad() {
    super.viewDidLoad()

    for word in wordsToTest {
        print("\(word) is a palindrome - ", isPalindrome(&word))
    }
}

How can I go about and fix it?

The real problem is the isPalindrome function. There is no reason why it should take an inout parameter. Change that function and don't worry about array being a constant. — Sulthan
Thanks. I have already solved the problem that way, and Im experimenting with different solutions for fun. isPalindrome is recursive and I did this to see if i could avoid instantiating new strings for each call. And this made me realize that i wouldnt modify the elements directly even if the array was a 'var'. And I wanted to learn more about it. So there is a reason, however how silly :P — Lord Fresh

PGDev PGDev · Accepted Answer · 2017-08-19T14:58:02

Simply use var in for loop:

for var word in wordsToTest //Here
{
    print("\(word) is a palindrome - ", isPalindrome(&word))
}

How to make a an array of mutable strings

1 Answers