CODEWITHSUNDEEP
swiftoperator-keyword
Louis Jouannet
Louis Jouannet

Reputation: 1

Unary operator '++'

I am interested and beginning in Swift, but I can't fix that :

func countvalue(tableau : [String]){
    var b : Int = 0

    for var b in tableau {
       b++ // Unary operator '++' cannot be applied to an operand of type @lvalue String'
    }

    print("Il y a \(b) valeurs dans ce tableau.")
}

Upvotes: 0

Views: 819

Answers (2)

Fogmeister
Fogmeister

Reputation: 77641

I think what you want is this...

func countvalue(tableau : [String]){
    var b : Int = 0

    for _ in tableau {
       // the values in the array are not used so just ignore them with _
       b++ // Unary operator '++' cannot be applied to an operand of type @lvalue String'
    }

    print("Il y a \(b) valeurs dans ce tableau.")
}

But the value of b will be the same if you do...

var b = tableau.count

Except this is a lot more efficient as it does not have to iterate every value of the array.

Upvotes: 2

pjs
pjs

Reputation: 19855

The b in your loop is a different variable than the one outside the loop, and is masking it. Since tableau is an array of Strings, b in the loop is a String, and thus cannot be incremented.

Upvotes: 2

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