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# Promises

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

*   [Introduction](g3doc/index.md)
    *   [The problem with async
        code](g3doc/index.md#the-problem-with-async-code)
    *   [Promises to the rescue](g3doc/index.md#promises-to-the-rescue)
    *   [What is a promise?](g3doc/index.md#what-is-a-promise)
*   [Framework](g3doc/index.md#framework)
    *   [Features](g3doc/index.md#features)
    *   [Benchmark](g3doc/index.md#benchmark)
*   [Getting started](g3doc/index.md#getting-started)
    *   [Add dependency](g3doc/index.md#add-dependency)
    *   [Import](g3doc/index.md#import)
    *   [Adopt](g3doc/index.md#adopt)
*   [Basics](g3doc/index.md#basics)
    *   [Creating promises](g3doc/index.md#creating-promises)
        *   [Async](g3doc/index.md#async)
        *   [Do](g3doc/index.md#do)
        *   [Pending](g3doc/index.md#pending)
        *   [Resolved](g3doc/index.md#create-a-resolved-promise)
    *   [Observing fulfillment](g3doc/index.md#observing-fulfillment)
        *   [Then](g3doc/index.md#then)
    *   [Observing rejection](g3doc/index.md#observing-rejection)
        *   [Catch](g3doc/index.md#catch)
*   [Extensions](g3doc/index.md#extensions)
    *   [All](g3doc/index.md#all)
    *   [Always](g3doc/index.md#always)
    *   [Any](g3doc/index.md#any)
    *   [AwaitPromise](g3doc/index.md#awaitpromise)
    *   [Delay](g3doc/index.md#delay)
    *   [Race](g3doc/index.md#race)
    *   [Recover](g3doc/index.md#recover)
    *   [Reduce](g3doc/index.md#reduce)
    *   [Retry](g3doc/index.md#retry)
    *   [Timeout](g3doc/index.md#timeout)
    *   [Validate](g3doc/index.md#validate)
    *   [Wrap](g3doc/index.md#wrap)
*   [Advanced topics](g3doc/index.md#advanced-topics)
    *   [Default dispatch queue](g3doc/index.md#default-dispatch-queue)
    *   [Ownership and retain
        cycles](g3doc/index.md#ownership-and-retain-cycles)
    *   [Testing](g3doc/index.md#testing)
    *   [Objective-C <-> Swift
        interoperability](g3doc/index.md#objective-c---swift-interoperability)
    *   [Dot-syntax in Objective-C](g3doc/index.md#dot-syntax-in-objective-c)
*   [Anti-patterns](g3doc/index.md#anti-patterns)
    *   [Broken chain](g3doc/index.md#broken-chain)
    *   [Nested promises](g3doc/index.md#nested-promises)