Swift Topics

Swift Important Topics

Topics

What is value types and reference types in Swift?

What are optionals in Swift? ·      What is an implicitly unwrapped optional? ·      What are the correct ways to unwrap an optional value? ·      What is optional chaining?

In an enum what are raw and associated values?

What is Closures? ·      Trailing Closures? ·      Closures as Reference Types? ·      Escaping Closures? ·      AutoClosures? What is Capturing Values? What does it mean to “capture self” in a closure and why can it lead to a memory leak?

What are the Access Controls? ·      open, ·      public, ·      internal, ·      private, ·      fileprivate

When casting, when would you use as? vs as!

What is the difference between Objective-C and Swift for handling errors?

What does the @escaping keyword mean?

What is Object Comparison ·      Eqaulity == ·      Identitiy ===

What are type aliases? What does inferred typing mean in Swift? What is type safety?

Nil-Coalescing Operator Range Operators ·      Closed Range Operator ·      Half-Open Range Operator What is Unified Logging? guard Statement

Automatic Reference Counting (ARC) in Swift ·      How ARC Works ·      Strong Reference Cycles Between Class Instances ·      Resolving Strong Reference Cycles Between Class Instances ·      Weak References ·      Unowned References

What are failable and throwing initializers? What are designated and convenience initializers?

What’s new in String ? ·      String Interpolation ·      Extended Grapheme Clusters ·      Unicode Representations of Strings

What’s Tuple in Swift ?

Properties ·      Stored Properties ·      Lazy Stored Properties ·      Stored Properties and Instance Variables ·      Computed Properties ·      Read-Only Computed Properties ·      Property Observers ·      Querying and Setting Type Properties

What’s new in Swift Collections?

What are generics in Swift?

What’s new in Swift Control Flow?

What’s new in Swift Functions? ·      What is In-Out Parameters? ·      Function Types as Parameter Types ·      Function Types as Return Types ·      How do we use Functions as first class type?

What is mutating method? Mutating Method Requirements

Interoperability between Swift and Objective-C ·      Bridged Types ·      id Compatibility ·      Downcasting Any ·      Unrecognized Selectors and Optional Chaining ·      Nullability and Optionals ·      Bridging Optionals to Nonnullable Objects ·      Extensions ·      Selectors ·      Keys and Key Paths

Adopting Cocoa Design Patterns in Swift from Obj-C ·      Delegation ·      Lazy Initialization ·      Error Handling ·      Key-Value Observing ·      Target-Action ·      Singleton ·      Introspection ·      Serializing