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Mastering Kotlin Coroutines

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Getting Started

Introduction to Kotlin Coroutines About the Course

Understanding Kotlin Coroutines

Kotlin Coroutines vs. JVM Libraries Kotlin Coroutines in Frequent Use Cases Thread Switching and Callbacks RxJava and Other Reactive Streams Using Kotlin Coroutines Coroutines on the Backend Sequence Builder Sequence Builder Real-life Usages Challenge: Factorial of a Given Number Solution: Factorial of a Given Number How Does Suspension Work?Resuming with a Value Resuming Suspension with an Exception Challenge: Suspension Coroutine with Specified Type for Output Solution: Suspension Coroutine with Specified Type for Output Quiz: Understanding Kotlin Coroutines

Coroutines Under the Hood

Introduction: Coroutines Under the Hood

A Function with a State and Resumed Value

Performance of Suspending Functions

Coroutines: Built-in Support vs. Library

Challenge: Coroutines Under the Hood

Solution: Coroutines Under the Hood

Quiz: Coroutines Under the Hood

Kotlin Coroutine Library

Introduction: Kotlin Coroutine Library Coroutines Builders: The launch Builder Coroutines Builders: The runBlocking Builder Coroutines Builders: The async Builder Structured Concurrency Coroutine Builders: Using coroutineScope Challenge: Coroutine Builders Solution: Coroutine Builders Quiz: Coroutine Builders

Coroutine Context

Interface and Finding Elements in Coroutine Context Adding, Emptying, and Subtracting Elements and Folding Contexts Coroutine Context: Accessing and Creating Context Challenge: Coroutine Context Solution: Coroutine Context Quiz: Coroutine Context

Job and Awaiting Children

Introduction: Job and Awaiting Children Coroutine Builders Job Job Factory Function Challenge: Job and Awaiting Children Solution: Job and Awaiting Children Quiz: Job and Awaiting Children

Cancellation and Exception Handling

Cancellation How Does Cancellation Work?Cancellation: Stopping the Unstoppable Challenge: Cancellation of a Job Solution: Cancellation of a Job Exception Handling Other Ways of Exception Handling Challenge: Exception Handling Solution: Exception Handling Quiz: Cancellation and Exception Handling

Coroutine Scope Functions

Coroutine Scope Functions More About coroutineScope Functions Similar to coroutineScope Connecting Coroutine Scope Functions Challenge: Coroutine Scope Functions Solution: Coroutine Scope Functions Quiz: Coroutine Scope Functions

Dispatchers and Constructing a Coroutine Scope

Dispatchers I/O Dispatchers More on Dispatchers Mechanism and Performance of Dispatchers Challenge: Dispatchers Solution: Dispatchers Constructing a Coroutine Scope More on Constructing a Coroutine Scope Quiz: Dispatchers and Constructing a Coroutine Scope

Shared State

The Problem with Shared State A Dispatcher Limited to a Single Thread Advantages and Problems with Mutex Challenge: The Problem with Shared State Solution: The Problem with Shared State Quiz: Shared State

Testing Kotlin Coroutines

Testing Suspending Functions Functions Used in Testing Kotlin Coroutines More on Testing Kotlin Coroutines Testing Functions Properties Testing Android Functions That Launch Coroutines Challenge: Testing Kotlin Coroutines Solution: Testing Kotlin Coroutines Quiz: Testing Kotlin Coroutines

Channel and Actors

What Is a Channel?Channel Types Channel Parameters Channels as a Communication Primitive Actors Challenge: Channel and Actors Solution: Channel and Actors Quiz: Channel and Actors

Hot and Cold Data Sources

Hot vs. Cold Hot Channel and Cold Flow Challenge: Hot and Cold Data Sources Solution: Hot and Cold Data Sources Quiz: Hot and Cold Data Sources

Flow

Introduction to Flow Characteristics, Elements, and Real-life Use Cases of Flow Challenge: Practice a Suspending Function Using Flow Solution: Practice a Suspending Function Using Flow Quiz: Flow

Flow Building

Different Ways of Building Flows Understanding Flow Builder Challenge: Flow Building Solution: Flow Building Quiz: Flow Building

Flow Lifecycle Functions

Functionalities of Different Functions More on Flow Lifecycle Functions Challenge: Flow Lifecycle Functions Solution: Flow Lifecycle Functions Quiz: Flow Lifecycle Functions

Flow Processing, SharedFlow, and StateFlow

Flow Processing Collection Processing The fold and scan Functions flatMap and Terminal Operations Challenge: Flow Processing Solution: Flow Processing SharedFlow and StateFlow Extension of SharedFlow Quiz: Flow Processing, SharedFlow, and StateFlow

Wrap Up!

Solution: Coroutines Under the Hood

See the solution to the coroutines under the hood problem.

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Solution
Explanation

Solution

We could start the function from two places: either from the beginning (in the case of a first call), or the point after suspension (in the case of resuming from continuation). To identify the current state, we use a field called a label. At the start, it is 0. Therefore, the function will start from the beginning. However, it's set to the next state before each suspension point so that we start from just after the suspension point after a resume.

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