Linked Questions
38 questions linked to/from structure vs class in swift language
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What are the main differences between classes and structs in swift 3? [duplicate]
The only thing I found is that a struct cannot inherit but a class does, and that a struct is passed by value while a class is passed by reference, but I couldn't understand what is that exactly.
Can ...
user7172547
0
votes
1
answer
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I am confuse structure vs class in swift language [duplicate]
I am confused about structure vs class. I have seen this example According to this example structure-vs-class According to link may be code output is 15,15,15,20
BUT code output is
because ...
929
votes
17
answers
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What is PECS (Producer Extends Consumer Super)?
I came across PECS (short for Producer extends and Consumer super) while reading up on generics.
Can someone explain to me how to use PECS to resolve confusion between extends and super?
- 29.6k
569
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17
answers
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Why Choose Struct Over Class?
Playing around with Swift, coming from a Java background, why would you want to choose a Struct instead of a Class? Seems like they are the same thing, with a Struct offering less functionality. Why ...
- 9,501
374
votes
32
answers
232k
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What is the difference between `let` and `var` in Swift?
What is the difference between let and var in Apple's Swift language?
In my understanding, it is a compiled language but it does not check the type at compile time. It makes me confused. How does the ...
- 4,987
491
votes
9
answers
202k
views
Static vs class functions/variables in Swift classes?
The following code compiles in Swift 1.2:
class myClass {
static func myMethod1() {
}
class func myMethod2() {
}
static var myVar1 = ""
}
func doSomething() {
myClass....
- 92.6k
205
votes
12
answers
114k
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Mutable vs immutable objects
I'm trying to get my head around mutable vs immutable objects. Using mutable objects gets a lot of bad press (e.g. returning an array of strings from a method) but I'm having trouble understanding ...
- 60.2k
141
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10
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Is Swift Pass By Value or Pass By Reference
I'm really new to Swift and I just read that classes are passed by reference and arrays/strings etc. are copied.
Is the pass by reference the same way as in Objective-C or Java wherein you actually ...
- 8,513
141
votes
8
answers
73k
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Swift and mutating struct
There is something that I don't entirely understand when it comes to mutating value types in Swift.
As the "The Swift Programming Language" iBook states: By default, the properties of a value type ...
- 2,075
110
votes
6
answers
70k
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When to use @objc in Swift?
In Swift, I see some methods like:
@objc private func doubleTapGestureRecognized(recognizer: UITapGestureRecognizer)
I was wondering, when to use @objc? I read some documents, but they are saying ...
- 9,804
90
votes
5
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Swift - what's the difference between metatype .Type and .self?
What's the difference between metatype .Type and .self in Swift?
Do .self and .Type return a struct?
I understand that .self can be used to check with dynamicType. How do you use .Type?
- 41.6k
82
votes
4
answers
44k
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Swift stack and heap understanding
I want to understand what is stored in the stack and heap in swift. I have a rough estimation:
Everything that you print and the memory address appears not the values, those are stored in the stack, ...
- 12k
51
votes
7
answers
23k
views
What are the differences between functions and methods in Swift?
I always thought functions and methods were the same, until I was learning Swift through the "Swift Programming Language" eBook. I found out that I cannot use greet("John", "Tuesday") to call a ...
- 10.5k
57
votes
3
answers
16k
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What is a 'non-nominal type' in Swift?
I see this error when trying to extend unorthodox 'types' like (Int, Int), or Any:
Non-nominal type 'Any' cannot be extended
So what makes a type non-nominal? What's the difference between a non-...
- 9,418
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votes
8
answers
16k
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What is Protocol Oriented Programming in Swift? What added value does it bring?
From Apple's own website: "At the heart of Swift's design are two incredibly powerful ideas: protocol-oriented programming and first class value semantics."
Can someone please elaborate what exactly ...
- 37.2k