Initializing a variable with a function in a class

Question

I have a class sort of like the one below. It is simplified, but it illustrates my problem. I want to initialize the "number" variable with the function "square".

class SomeClass {
    let number: Int
    func square (num: Int) -> Int {
        return num * num
    }
    init(num: Int) {
        number = square(num)
    }
}

But when i make an instance of the class. For example

let instance = SomeClass(num: 2)

it throws the error: use of 'self' in method call 'square' before all stored properties are initialized.

How can i initialize the number by using the function?

0x416e746f6e · Accepted Answer · 2015-12-07 16:11:19Z

7

In this particular case you can use class method:

class SomeClass {
    let number: Int
    class func square (num: Int) -> Int {
        return num * num
    }
    init(num: Int) {
        number = SomeClass.square(num)
    }
}

answered Dec 7, 2015 at 16:11

0x416e746f6e

10.1k6 gold badges46 silver badges72 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

user3441734 · Accepted Answer · 2015-12-07 16:12:53Z

-2

the only way, how to do what you want to do, is declare the number as var and initialize it with some value

class SomeClass {
    var number: Int = 0
    func square (num: Int) -> Int {
        return num * num
    }
    init(num: Int) {
        number = square(num)
    }
}

let instance = SomeClass(num: 2)
instance.number // 4

answered Dec 7, 2015 at 16:12

user3441734

17.7k3 gold badges45 silver badges63 bronze badges

Collectives™ on Stack Overflow

Initializing a variable with a function in a class

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related