Promises

Promises is a modern framework that provides a synchronization construct for Objective-C and Swift to facilitate writing asynchronous code.

• Introduction
  • The problem with async code
  • Promises to the rescue
  • What is a promise?
• Framework
  • Features
  • Benchmark
• Getting started
  • Add dependency
  • Import
  • Adopt
• Basics
  • Creating promises
    • Async
    • Do
    • Pending
    • Resolved
  • Observing fulfillment
    • Then
  • Observing rejection
    • Catch
• Extensions
  • All
  • Always
  • Any
  • Await
  • Delay
  • Race
  • Recover
  • Reduce
  • Retry
  • Timeout
  • Validate
  • Wrap
• Advanced topics
  • Default dispatch queue
  • Ownership and retain cycles
  • Testing
  • Objective-C <-> Swift interoperability
  • Dot-syntax in Objective-C
• Anti-patterns
  • Broken chain
  • Nested promises