What is Reactive Programming?
Gowtham Kumar

Is it true that when we debugging data in FP via callback inside callback (callback hell) ? Do you have examples of it? And i guess that you area using javascript , is it correct ?

Actually, what we program using FP is the data or data transformation , basic concept of FP is, one function will have one input and only to produce one output, transform from X to Y .

Other basic concept of FP is, we should can to replace a function with their expected output value (referential transparency), and this is mean, when we do programming using FP we are focus on data computation / data transformation what we need to debug ? the data, right? pure functional should be help programmers to reduce side effects.

I dont understand with your statements, write many callbacks, but from my opinion, I think it’s not have any relation with FP

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