Cannot assign to property: 'card' is a 'let' constant in a for loop in swift [duplicate]

Question

Cannot assign to property: 'card' is a 'let' constant in for loop in chooseCard method. I am not able to figure out why the error is coming in the for loop .what am I missing in the code .Please help.

import Foundation

class Concentration {

    var cards = [Card]()

    var faceUpCount = 0

    func chooseCard(atIndex : Int) {
        var alreadyFaceUpCard  = Card()
        if faceUpCount == 0 {
            alreadyFaceUpCard = cards[atIndex]
            alreadyFaceUpCard.isFaceUp = true
            faceUpCount += 1
        }else if faceUpCount == 1 {
            var card = cards[atIndex]
            card.isFaceUp = true
            if alreadyFaceUpCard.identifier == card.identifier {
                alreadyFaceUpCard.isMatchUp = true
                card.isMatchUp = true
                faceUpCount += 1
            }

        }else {
            for card in cards {
                card.isFaceUp = false
            }

        }

    }



    init(numberOfPairsOfCards : Int) {
        for _ in 1...numberOfPairsOfCards {
            let card = Card()
            cards.append(card)
            cards.append(card)
        }
        // TODO: Shuffle Cards
    }


}

Answer 1

card is ofcourse a let constant, to make it variable use: for var card in cards