swift-learnings

Author: divyanshu-rawat

.gitignore

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+# Xcode
+#
+build/
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata
+*.xccheckout
+*.moved-aside
+DerivedData
+*.hmap
+*.ipa
+*.xcuserstate
+
+# CocoaPods
+#
+# We recommend against adding the Pods directory to your .gitignore. However
+# you should judge for yourself, the pros and cons are mentioned at:
+# http://guides.cocoapods.org/using/using-cocoapods.html#should-i-ignore-the-pods-directory-in-source-control
+#
+# Pods/
+
+# Carthage
+#
+# Add this line if you want to avoid checking in source code from Carthage dependencies.
+# Carthage/Checkouts
+
+Carthage/Build
+
+# Ignore those pesky DS_Store files!
+.DS_Store

AssociatedValues/AssociatedValues.playground/Pages/Associated Values.xcplaygroundpage/Contents.swift

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+//: [Previous](@previous)
+//: ### Associated Values
+//: Associated values are defined alongside enum cases. Associated values are not required; some enum cases may have an associated value while others do not. In the example below, `LibraryFee` has three cases with associated values and a case without an associated value.
+//:
+enum LibraryFee {
+    case overdueBook(Int)
+    case lostBook(Double)
+    case lostLibraryCard(Int)
+    case annualDues
+}
+
+let fee = LibraryFee.overdueBook(4)
+//: It can be very helpful to name associated values so that their intent is easily understood.
+//:
+enum DescriptiveLibraryFee {
+    case overdueBook(days: Int)
+    case lostBook(price: Double)
+    case lostLibraryCard(timesLost: Int)
+    case annualDues
+}
+
+let weekLateFee = DescriptiveLibraryFee.overdueBook(days: 7)
+//: Associated values are actually tuples. Therefore, an associated value can contain mutliple values. Recall from [Apple's documentation](https://developer.apple.com/library/content/documentation/Swift/Conceptual/Swift_Programming_Language/TheBasics.html#//apple_ref/doc/uid/TP40014097-CH5-ID329) that tuples are multiple values grouped into a single compound value.
+//:
+import UIKit
+
+enum ImageFilter {
+    case sepia
+    case verticalGradient(from: UIColor, to: UIColor)
+    case horizontalGradient(from: UIColor, to: UIColor)
+    case sketch(penThickness: Double?)
+}
+
+let fadeToBlack = ImageFilter.horizontalGradient(from: .gray, to: .black)
+//: - Callout(Watch Out!):
+//: If all enum cases have an associated value of the same type, and it is static, then you might consider using a raw value instead.
+//:
+// the associated values for `AudioRateAssociated` should be raw values
+enum AudioRateAssociated {
+    case slow(value: Int)
+    case normal(value: Int)
+    case fast(value: Int)
+    case custom(value: Int)
+}
+
+enum AudioRateRaw: Int {
+    case slow, normal, fast, custom
+}
+//: [Next](@next)