Launch and Async in Kotlin Coroutines: Launch is like firing a rocket without expecting anything back, while Async is like performing a task and getting rewarded for it. Launch returns a job without any resulting value, whereas Async returns a deferred job with a await function to get the result. Launch crashes the app if unhandled exception occurs, while Async silently drops the exception unless handled. So, choose wisely! ๐๐
Introduction
In this video, we will explore the differences between the concepts of launch and async in Kotlin coroutines, breaking down their functionality and use cases in the Android programming environment.
Key Takeaways
| Concept | Description |
|---|---|
| launch | Used for "fire and forget" tasks, does not return a resulting value |
| async | Performs a task and returns a result, returns an instance of Def job with a weight function |
| Exception Handling | launch block can crash the application if not handled; async stores exceptions in the resulting Deford job |
Basic Functionality
Both launch and async are used to start coroutines in Kotlin, with launch returning a job and async returning an instance of Def job with a weight function.
Usage of launch
While using launch, the resulting job does not carry any resulting value and is primarily used for "fire and forget" tasks where the completion of the task is more important than the result.
| Usage |
|---|
| Global scope do launch dispatchers do default and to be noted |
Usage of async
In contrast, async is used to perform a task and retrieve a result, with the resulting Deford job providing the ability to use the await function to obtain the result.
| Usage |
|---|
Global scope: do async Returns the defer job |
Difference in Exception Handling
Another crucial difference between launch and async is seen in exception handling. While unhandled exceptions in the launch block can crash the application, exceptions in the async block are stored silently in the resulting Deford job.
Conclusion
In summary, launch focuses on "fire and forget" tasks and does not return a resulting value, while async is used to perform a task and retrieve a result using the instance of Def job with a weight function. Additionally, the difference in exception handling behavior between the two functions is highlighted.
Key Takeaways
- launch is used for "fire and forget" tasks
- async performs a task and returns a result
- launch returns a job without a resulting value
- async returns an instance of Def job with a weight function
- Exception handling differs between launch and async
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