How do I compare two objects in Swift?
When you need to compare two custom objects, you have to provide the custom implementation of the comparison operator through the Equatable protocol. In Java, you would override the equals method instead. Making your class compliant with the Equatable protocol is the only way two objects should be compared by value.
How do you check if two objects are the same in Swift?
!== and === are identity operators and are used to determine if two objects have the same reference. Swift also provides two identity operators (=== and ! ==), which you use to test whether two object references both refer to the same object instance.
What is the difference between == and === in Swift?
In addition, because IntegerRef conforms to the Equatable protocol, instances can also be compared using the equal-to operator ( == ). The identical-to operator ( === ) returns false when comparing two references to different object instances, even if the two instances have the same value.
What is use of === in Swift?
The === or identity operator compares the identity of the objects. It checks whether the operands refer to the same object. As you can see, arr1 and arr2 do not refer to the same object, despite the objects being equal.
What is comparable in Swift?
The Comparable protocol allows use to use the < , > , <= , and >= operators with conforming data types, which in turn means that Swift knows how to sort arrays of those types.
What is data in Swift?
Data in Swift 3 is a struct that conforms to collection protocol. It is a collection of bytes ( [UInt8] array of unsigned integer 8 bits 0-255).
Is Swift an operator?
As operator is used to convert one type to another when compiler is guaranteeing the success of desired cast. With this operator, the source and destination are convertible to each other, and if not compiler will produce an error asking to avoid the incompatible cast.
What is difference between as As and As in Swift?
Type casting in Swift is implemented with the is and as operators. is is used to check the type of a value whereas as is used to cast a value to a different type.
Why Swift is faster?
Swift is faster than Objective-C, because it removed the limitations of C language and has been improved with the help of advanced software development technologies that were unavailable when C was developed. As mentioned by Apple, Swift was originally designed to operate faster.
Is Swift a good language?
Swift is a powerful and intuitive programming language for iOS, iPadOS, macOS, tvOS, and watchOS. Writing Swift code is interactive and fun, the syntax is concise yet expressive, and Swift includes modern features developers love. Swift code is safe by design, yet also produces software that runs lightning-fast.
What is Equatable and comparable in Swift?
“Equatable” relates to being equal, and “comparable” relates to the comparison between objects. This is important, because how can we be certain that two complex objects are the same? In many circumstances, this is something that you should decide.
What is a Swift extension?
Extensions add new functionality to an existing class, structure, enumeration, or protocol type. This includes the ability to extend types for which you don’t have access to the original source code (known as retroactive modeling). Extensions are similar to categories in Objective-C.
Is swift faster than Objective-C?
Is Swift faster than Objective C? According to Apple, Swift is approximately 2.6 times faster than Objective C. The speed calculated generally relates to the speed of coding. Swift’s syntax is much more simple and direct than Objective-C.
Should I learn Objective-C or Swift for string manipulation?
Objective-C requires a lot of code to go through compared to Swift, making the language highly cumbersome to apply in modern development situations where there is increasing demand to adopt agility to speed up the process. Also, string manipulation in Objective C will require you to work with placeholders or tokens.
What happens when an Objective-C programmed object calls for another object?
When an Objective-C programmed object calls for another object present in the code, there’s an added layer of activity involved. As a developer, you barely notice this the first time you compile code, since it happens quickly.