The expression a += 2 is shorthand for a = a + 2 . Effectively, the addition and the assignment are combined into one operator that performs both tasks at the same time . Note. The compound assignment operators don’t return a value. For example, you can’t write let b = a += 2 .
Read moreWhat is _ variable in Swift?
Variables are used to store data in memory so that we can use them in program . Variables are like container that can hold data which can be changed later. Every variable has a unique name called identifier.
Read moreWhat is _ in Swift function parameter?
Omitting Argument Labels If you don’t want an argument label for a parameter, write an underscore ( _ ) instead of an explicit argument label for that parameter. // refer to the argument values for the first and second parameters.
Read moreWhat does _: mean in Swift documentation?
In the documentation it is being used as a wildcard to indicate a function that takes an unnamed parameter .
Read moreWhy do we use _ in Swift?
The _ is a placeholder for the parameter name . In your example, you call them differently, in the second function, you need to write the parameter name a: 1 . Swift’s function name convention is funcName(param1:param2:) , and it needs the _ as a placeholder to create the name of the function.
Read moreWhat is the symbol in Swift?
Put simply, @UIApplicationMain is an indicator for Swift applications that indicates which object is your application’s main application delegate file. In Objective-C application templates, you would have a trivial main. m C file which sets the application delegate.
Read moreWhat does == mean in Swift?
The == or equality operator checks whether the two operands are equal . What equal means for an object depends on the implementation of the class or structure. For the NSArray class, the contents of the arrays are compared. In the above example, arr1 is equal to arr2 because the values stored in the arrays are equal.
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