Equatable in Swift

Equatable in Swift

By : Comhk
Date : November 22 2020, 02:59 PM
will be helpful for those in need Exactly what it says. Move the operator function definition outside of the extension. It's done at a global scope.
code :

Share : facebook icon twitter icon
Comparing dictionaries containing actually equatable types, based on non-equatable data structures

Comparing dictionaries containing actually equatable types, based on non-equatable data structures

By : Abir Sm
Date : March 29 2020, 07:55 AM
like below fixes the issue The == operator for dictionaries requires that both Key and Value type conform to Equatable.
You have implemented a (restricted) == operator for SortedList. But implementing a == operator for a type does not make that type Equatable automatically. The conformance must be declared explicitly.
code :
func ==<Key : Equatable, T : Equatable>(lhs: [Key : SortedList<T>], rhs: [Key : SortedList<T>]) -> Bool {
    // ...
Why doesn't array conform to Equatable, when its items are Equatable in Swift?

Why doesn't array conform to Equatable, when its items are Equatable in Swift?

By : Anton Zhyravlev
Date : March 29 2020, 07:55 AM
help you fix your problem Swift 4.1 update:
With the introduction of conditional conformance in Swift 4.1, Array now conforms to Equatable, so the issue should be resolved without the need to resort to any workarounds.
code :
import Foundation

struct Post: Equatable {
    let text: String

enum Result<T>: Equatable where T: Equatable {
    case success(result: T)
    case error
func test() {

    // Test 1: Check Post type for equality: OK
    let post1 = Post(text: "post")
    let post2 = Post(text: "post")

    if post1 == post2 {
        print("equal posts")

    // Test 2: Check [Post] type for equality: OK
    let arrayOfPosts1 = [post1, post2]
    let arrayOfPosts2 = [post1, post2]

    if arrayOfPosts1 == arrayOfPosts2 {
        print("equal arrays of post")

    // Test 3: Check Result<Post> type for equality: OK
    let result1 = Result<Post>.success(result: post1)
    let result2 = Result<Post>.success(result: post2)

    if result1 == result2 {
        print("equal results of post")

    // Test 4: Check Result<[Post]> type for equality: OK
    let arrayResult1: Result<[Post]> = Result<[Post]>.success(result: arrayOfPosts1)
    let arrayResult2: Result<[Post]> = Result<[Post]>.success(result: arrayOfPosts2)

    if arrayResult1 == arrayResult2 {
        print("equal results of array of posts")
 equal posts
 equal arrays of post
 equal results of post
 equal results of array of posts
Equatable with enum - Swift

Equatable with enum - Swift

By : user3135669
Date : March 29 2020, 07:55 AM
I hope this helps . The enum case CannotFetch has an associated value of type String. That means, when the enum case is set to CannotFetch, a specific String is associated with that case. Read through the official Swift documentation about Enumerations if you need to understand Associated Values.
The func ==() method is a so called Equivalence Operator. You can read more about it in the official Swift documentation about Advanced Operators.
code :
let enumOne = ErrorAPI.CannotFetch("Hi")
let enumTwo = ErrorAPI.CannotFetch("Hello")

if enumOne != enumTwo {
    print("They are not equal!")
} else {
    print("They are equal")
Understanding Equatable in swift 3?

Understanding Equatable in swift 3?

By : Alejandro Santiago
Date : March 29 2020, 07:55 AM
wish helps you By definition, two enums of the same type are equal if they are of the same case. Thus .image is equal to .image, for example. That is why you are able to test enum instances against one another using the == operator to find out what case something is. Indeed, this fact is sort of the point of enums.
(This, by the way, is also why enums cannot have stored properties. Two .image instances with different stored values for the same property would not be equal. And that would completely defeat the purpose of enums.)
Swift Equatable on a protocol

Swift Equatable on a protocol

By : jjefferies
Date : March 29 2020, 07:55 AM
it fixes the issue If you directly implement Equatable on a protocol, it will not longer be usable as a type, which defeats the purpose of using a protocol. Even if you just implement == functions on protocols without Equatable conformance, results can be erroneous. See this post on my blog for a demonstration of these issues:
Related Posts Related Posts :
  • What's going on with this generic function?
  • How to implement a failable initializer for a class conforming to NSCoding protocol in Swift?
  • Swift: optional or implicit UILabel?
  • Swift: ¨Unrecognized selector sent to instance¨
  • Initialize a dictionary with non-optional empty arrays in Swift
  • Compare Day/Month in Swift Struct
  • swift reflection causes impossible nil value for any
  • How to populate an SKShapeNode uniformly
  • Using AWS API Gateway generated SDK for both authenticated and anonymous access
  • Underscored properties in Swift classes?
  • Subclass of UIButton with rounded corners (swift)
  • Google API Maps don't show up on TabBar Application
  • Can't hide status bar in AVPlayerViewController's portrait mode
  • Send JSON Array and store in database using api calls
  • Return one of two possible classes instances
  • What is type of 123_456_789?
  • dispatch queue concurrent not work as except in swift
  • Calculate count of years
  • Swift property observer in protocol extension?
  • Calling function with optional type in Swift
  • in Swift, what does this specific syntax mean?
  • Nil cannot be assigned to type AVCaptureDeviceInput
  • Parse - Query with 'includeKey' not getting objects in proper subclass
  • Best way to set up multiple tableviewcell layouts
  • Swift Bridging Header for Obj-C
  • Swift dictionary with weak reference keys?
  • Commit failed - the repository is locked, XCode 7
  • How to convert Swift Bool? -> String?
  • Swift: Cannot convert value of type 'NSDate' to expected argument type 'NSDateComponents'
  • JSON parsing error in Swift 2.0
  • Varying value inside runAction() not changing
  • Swift - bar button item image / set size and width
  • Radio button UI in Swift
  • NSdate range total removing weekends Swift
  • Why isn't addTarget calling my target's action in an extension
  • How to make a cell hold multiple text labels in ios
  • Setter for dictionary property - OR: get last added item from dictionary
  • Extending Dictionary with constraints
  • Spritekit rotating multiple nodes around center
  • Swift: Trying to implement NSCoding
  • Array of String printing Optional, why?
  • Dynamic attributes (getters/setters) in Swift on data models
  • Setting file attributes in Swift
  • Window visible on all spaces (including other fullscreen apps)
  • How to draw lines on UIImage with swift ?
  • Is it possible use non read-only computed property in extension?
  • How do I save a MKPointAnnotation to Pars?
  • Take a snapshot of current screen with Metal in swift
  • Is there any way to determine sub-protocol conformance for instance conforming to generic protocol in Swift 2 (at runtim
  • Custom physics body adding unwanted extra line
  • Define a Swift protocol which requires a specific type of sequence
  • Swift tvOS in-app purchase doesn't respond
  • Swift calculate incremental average with reduce and
  • push from custom cell nib to viewController
  • Detect when a tab bar item is pressed
  • When using < operator swift goes over specified number before exiting
  • Swift Struct Identity
  • Core Data syncing in Swift
  • Increase Sprite ContainsPoint Size
  • Swift initializer for public class
  • shadow
    Privacy Policy - Terms - Contact Us © animezone.co