I want to use the output of a function A in let says function B. Sometimes we don’t have those parameters in function B, then how can we use the function A output in function B.
You can’t. If you need the output of function A you either need to call it and pass the output of it as an parameter to function B, or you need to call function A with arguments in function B.
Your question is quite theoretical, maybe you can share the problem you’re actually trying to solve (if you have a concrete thing you’re trying to achieve). Functional is a different way of programming but it can solve the same problems as OOP, it just needs a different way of thinking about the problem you want to solve.
