[swift-users] Needing self when one initialiser method calls another.

[Jo Albright]

Hi Diego,

Since you have not given the x & y variables initial values, it requires them to be set inside the init. You can write it like below instead of calling the other self.init

struct Vector {
    
    var x: Double
    var y: Double
    
    init() {
        x = 0
        y = 0
    }
    
    init(x: Double, y: Double) {
        self.x = y
        self.y = y
    }

}


Designer . Developer .  Nerd 
Jo Albright


> On Jan 14, 2016, at 11:48 PM, Diego Barros via swift-users <swift-users at swift.org> wrote:
> 
> Hi all,
> 
> ​Given the ​following example:
> 
> struct Vector {
> 	var x: Double
> 	var y: Double
> 	
> 	init() {
> 		self.init(x: 0, y: 0)
> 	}
> 	
> 	init(x: Double, y: Double) {
> 		self.x = y
> 		self.y = y
> 	}
> }
> 
> I'm just curious as to why the self (in bold) is needed in the init() that's calling init(x: Double, y: Double)? Can't the compiler infer from the parameters what should be called?
> 
> - Diego
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