Johathan  Boehm

Johathan Boehm

1614111540

Introducing Coroutines StateFlow

Takeaway From This Article

In this article, you’ll learn what StateFlow is, how to use it, the advantages of using it, and the explanation of some real-time problems, with solutions. By comparing it to the LiveData, I’ll post my thoughts about the use of StateFlow over the use of LiveData.

Introduction

Flow API in Coroutines is a better way to handle the stream of data; StateFlow attempts to bring the powerful features of Flow to manage a state in your application. If you see the syntax of StateFlow, it’s extended by SharedFlow. Have a look:

@ExperimentalCoroutinesApi interface StateFlow<out T> : 
    SharedFlow<T> (source)

A SharedFlow is a read-only state with a single updatable data value that emits updates to its collectors. A state flow is a hot flow, unlike the regular flow, because its active instance exists independently of collectors’ presence. The current value of StateFlow can be retrieved through value property.

StateFlow comes in two variants — StateFlow and MutabaleStateFlow.

  • StateFlow<T> interface is a read-only view that gives access to the current value and implements a Flow<T> to collect updates to the values.
  • MutabaleStateFlow<T> interface adds a value-modification operation.

How to Use StateFlow

First, let’s create an enum class and include a few states that we need to manage in the view when triggered by viewModel. Have a look at the enum class:

enum class CustomStates{
    SHOW_LOADING, HIDE_lOADING, SHOW_TOAST, HOMESCREEN, BACK
}

#kotlin #android #mobile

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Introducing Coroutines StateFlow
Johathan  Boehm

Johathan Boehm

1614111540

Introducing Coroutines StateFlow

Takeaway From This Article

In this article, you’ll learn what StateFlow is, how to use it, the advantages of using it, and the explanation of some real-time problems, with solutions. By comparing it to the LiveData, I’ll post my thoughts about the use of StateFlow over the use of LiveData.

Introduction

Flow API in Coroutines is a better way to handle the stream of data; StateFlow attempts to bring the powerful features of Flow to manage a state in your application. If you see the syntax of StateFlow, it’s extended by SharedFlow. Have a look:

@ExperimentalCoroutinesApi interface StateFlow<out T> : 
    SharedFlow<T> (source)

A SharedFlow is a read-only state with a single updatable data value that emits updates to its collectors. A state flow is a hot flow, unlike the regular flow, because its active instance exists independently of collectors’ presence. The current value of StateFlow can be retrieved through value property.

StateFlow comes in two variants — StateFlow and MutabaleStateFlow.

  • StateFlow<T> interface is a read-only view that gives access to the current value and implements a Flow<T> to collect updates to the values.
  • MutabaleStateFlow<T> interface adds a value-modification operation.

How to Use StateFlow

First, let’s create an enum class and include a few states that we need to manage in the view when triggered by viewModel. Have a look at the enum class:

enum class CustomStates{
    SHOW_LOADING, HIDE_lOADING, SHOW_TOAST, HOMESCREEN, BACK
}

#kotlin #android #mobile

Annalise  Hyatt

Annalise Hyatt

1598467980

Coroutines in Python

Prerequisites: You should know about iterators and how a for loop in Python works behind the scenes. You don’t need to know anything about generators, coroutines, or the _yield_ keyword.

Just a quick overview of how a for loop works in Python:

OUTPUT :

1
2
3
4
5

The code above is equivalent to the code given below:

OUTPUT :

1
2
3
4
5

What Are Coroutines?

Coroutines are basically functions whose execution can be paused/suspended at a particular point, and then we can resume the execution from that same point later whenever we want.

We need a mechanism — or to be more precise, a keyword — by which we can insert a checkpoint and tell the program that we want to pause the execution of the function here and return control to the point it called from. We’ll resume the execution whenever we want.

#data-science #concurrency #coroutine #python #programming

[Unity3d] WaitForFrames in Coroutine

If you are using Coroutines in Unity3d, you probably know about WaitForSeconds, WaitForEndOfFrame and WaitForFixedUpdate classes. Here is an example:

public IEnumerator CoroutineAction()
{
    // do some actions here    
    yield return new WaitForSeconds(2); // wait for 2 seconds
    // do some actions after 2 seconds
}

#c# #unity3d #coroutine #programming-c

Archie  Clayton

Archie Clayton

1629258238

5 Kotlin Questions About Coroutines

In this episode of 5 Kotlin Questions, Vsevolod Tolstopyatov, the lead of Kotlin libraries team, answers 5 popular questions about the present and the future of Coroutines.

00:37 What are the Kotlin team's thoughts regarding Project Loom?
02:28 Is there a roadmap on what is next for kotlinx.coroutines?
03:24 What will be the next big thing in kotlinx.coroutines and when to expect it?
04:28 Reactive libraries or kotlinx.coroutines?
05:34 When can we expect a proper multithreaded coroutines on Kotlin Native?

#coroutines #kotlin 

Adelle  Hackett

Adelle Hackett

1589912280

Introducing MongoDB Developer Hub

We are excited to announce the launch of our new Developer Hub: https://developer.mongodb.com. The Developer Hub will serve as the central location for all MongoDB developer content, programs, and resources. We built the Developer Hub from the ground up to serve the needs of developers using MongoDB products like MongoDB Atlas and MongoDB Stitch.

#introducing #mongodb #developer