„Everything flows”, said Heraclitus. The reactive paradigm followers like to say that „everything is a stream”. The phrase attributed to Heraclitus is valid for both functional and reactive paradigms. In the first one, we have pipelines, in the second one – streams. That testifies to the significant similarity between these paradigms and shows that reactive programming (but more FRP) is, in fact, an asynchronous implementation of a functional flow.