CODEWITHSUNDEEP
swiftdelphiswift2
Rafael Mogone
Rafael Mogone

Reputation: 21

What's the "with ... do" swift equivalent

When coding in Delphi, I can use this syntax to make my code better seen:

with person do begin       
    setFirstName("Frodo");
    setLastName("Baggins");
    setAge(25);
    enableRing;
    sendToQuest;
end;

That would be the same of:

person.setFirstName("Frodo");
person.setLastName("Baggins");
person.setAge(25);
person.enableRing;
person.sendToQuest;

That's only for code better looking, nothing else.

Is there any equivalent of Delphi's "with .. do" syntax in swift 2?

Upvotes: 1

Views: 481

Answers (4)

John
John

Reputation: 33

You can now use keyPaths. Although it doesn't really improve readability, it does shorten nested properties.

struct ExampleStruct {
    var somePropertyOfTheExampleStruct : CGPoint
}

var aVar = ExampleStruct(somePropertyOfTheExampleStruct: .zero)

// Change some values
aVar.somePropertyOfTheExampleStruct.x = 2.0
aVar.somePropertyOfTheExampleStruct.y = 3.0

// This does the same thing
let k = \ExampleStruct.somePropertyOfTheExampleStruct
aVar[keyPath: k].x = 2.0
aVar[keyPath: k].y = 3.0

Upvotes: 0

Cosneanu Cristian
Cosneanu Cristian

Reputation: 79

I did manage to simulate this effect with a simple function...

func with<T>(_ element: T, _ make: (T) -> ()) {
     make(element)
}

In case you do not like < make > you can replace it with < `do` > works same...

and from:

 minLat = Swift.max(location.coordinate.latitude, minLat)
 minLong = Swift.max(location.coordinate.longitude, minLong)
 maxLat = Swift.min(location.coordinate.latitude, maxLat)
 maxLong = Swift.min(location.coordinate.longitude, maxLong)

I got:

with(location.coordinate) { c in
    minLat = Swift.max(c.latitude, minLat)
    minLong = Swift.max(c.longitude, minLong)
    maxLat = Swift.min(c.latitude, maxLat)
    maxLong = Swift.min(c.longitude, maxLong)
}

It came out pretty cute...

Upvotes: 2

David Heffernan
David Heffernan

Reputation: 612954

Is there any equivalent of Delphi's "with .. do" syntax in Swift 2?

No there is not.

Upvotes: 1

spirographer
spirographer

Reputation: 630

You can use the tuple type to set multiple fields of a struct. This has much better encapsulation than the with ... do construct, although it looks like what you are trying to do would be better handled with an instance method.

Upvotes: 0

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