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iOS

Bojan Hinic
Bojan Hinic
1,477 Points
Posted by Bojan Hinic
Bojan Hinic
1,477 Points

How to access named parameter when call function?

Hi everyone,

After calling function I'm trying to access parameter with (number) and (by) interpolation but returns error (Use of unresolved identifier 'number' and 'by').

How can I access these values?

func isDivisible(#number: Int, #by: Int) -> Bool?{
    if number % by == 0{
        return true
    }else{
    return nil
    }
}

if let test = isDivisible(number: 65,by: 5){
    println("\(number) is divisible \(by).")
} else{
    println("Not divisible.")
}

2 Answers

Ricardo Hill-Henry
Ricardo Hill-Henry
38,442 Points

I don't believe you had to do print them out like so. However, if you're just trying to experiment, I'll have a go.

First, you can't access a parameter's value because they don't actually store a value. Parameters give you the ability to take an inputted value, and store it in a variable or constant, or manipulate a value within a function. If you want to access the value that was input into the function, you'll need some way of storing said value(s). If you want to access the values inside the function outside the function's scope you'll need to use global variables (variables declared at the top of the program, or in this case just before the function's declaration). 

var numberVar = 0
var byVar = 0
func isDivisible(#number: Int, #by: Int) -> Bool?{
    numberVar = number
    byVar = by
    if number % by == 0{
        return true
    }else{
        return nil
    }
}

if let test = isDivisible(number: 65, by: 5){
    println("\(numberVar) is divisible \(byVar).")
} else{
    println("Not divisible.")
}
Bojan Hinic
Bojan Hinic
1,477 Points
Bojan Hinic
Bojan Hinic
1,477 Points

Ricardo your explanation was really helpful. Thank you for your time.

Burak Gür
Burak Gür
3,747 Points
Burak Gür
Burak Gür
3,747 Points 
func isDivisible(#number: Int, #by: Int) -> Bool?{
    if number % by == 0{
        return true
    }else{
        return nil
    }
}

var number1: Int = 65
var number2: Int = 5

if let test = isDivisible(number: number1, by: number2){
    println("\(number1) is divisible \(number2).")
} else{
    println("Not divisible.")
}
Bojan Hinic
Bojan Hinic
1,477 Points
Bojan Hinic
Bojan Hinic
1,477 Points

Thank you for answering. I appreciate your help.