[swift-evolution] Customized Inline Init Closure

[Adriano Ferreira]

Hey there!

As a suggestion, check out this simple yet very interesting project called Then <https://github.com/devxoul/Then> by @devxoul.

Best,

— A

> On Jan 3, 2016, at 1:37 AM, Weston Catron via swift-evolution <swift-evolution at swift.org> wrote:
> 
> Ability to write an initializer while initializing an object.
> 
> Example
> 
> let name = “John Apple”;
> let person = Person {
>     self.name = nameInput.first() + " " + nameInput.last()
>     self.dob = dateInput.datetime()
>     If (self.age() > 18) {
>         self.taxableStatus = INDEPENDANT
>     } else {
>         self.taxableStatus = DEPENDANT
>     }
> };
> 
> Helpful examples: Objects with many required parameters that are defaulted in the initializers. 
> 
> SKLabelNode
> 
> let label = SKLabelNode(text: "Example") 
> label.position = CGPoint(x: 0, y: 250); 
> label.fontSize = 34; 
> label.fontColor = UIColor.blackColor() 
> self.addChild(label);
> 
> Can become:
> 
> let label = SKLabelNode(text: self.package!.title) {
>     self.position = CGPoint(x: 0, y: 250)
>     self.fontSize = 34
>     self.fontColor = UIColor.blackColor() 
> }
> self.addChild(label)
> 
> Readability Instead of a large amount of code setting up temporary variables to pass into an initializer, all initializing code could be wrapped in a closure.
> 
> Flexibility Instead of exhaustive initializers covering many use cases. Simpler initializers can be extended as needed. This can also encourage required properties over optional ones that are immediately defined. 
> 
> Compiler Warnings Closures react the same as initializers within classes, warning users of incomplete implementation of required properties.
> 
> Possible disadvantages:
> 
> Sloppy Coding Instead of writing complete initializers programmers can just rely on in-line initializers.  
> 
> Tried Before I found this feature is also available in C# (https://msdn.microsoft.com/en-us/library/bb397680.aspx <https://msdn.microsoft.com/en-us/library/bb397680.aspx>). Not sure if it was helpful then but many languages since don't appear to use it. 
> 
> -Weston
> 
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> swift-evolution at swift.org
> https://lists.swift.org/mailman/listinfo/swift-evolution

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