What is Rückruf Hoelle in Node js
What is "recall hell" and how and why does RX resolve it?
Suppose I want to run the following code:
I don't think I have to convince anyone that this version is uglier than the previous one. :-)
2) When (in which settings) does the "recall hell problem" occur?
When you have a lot of callback functions in your code! They get harder to work with the more of them you have in your code, and it gets especially bad when you have to do loops, try-catch blocks, and the like.
Instead, we may need to write at the end:
The number of questions we get here at StackOverflow is proof of how confusing it is :)
3) Why does it occur?
4) Or can "callback hell" also occur in a single threaded application?
Asynchronous programming has to do with parallelism, while a single thread has to do with parallelism. The two concepts are actually not the same.
What is the difference between parallelism and parallelism?
5) Could you please also show how RX solves the "recall hell problem" with this simple example?
I don't know anything specific about RX, but usually this problem is solved by adding native support for asynchronous computation in the programming language. Implementations can vary and include: Async, Generators, Coroutines, and Callcc.
In Python, we can implement the previous loop example with something that looks like this:
This is not the complete code, but the idea is that "yield" will hold our for loop until someone calls myGen.next (). The most important thing is that we can still write the code using a for loop without having to reverse the logic like we had to do in this recursive function.
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