Functional Programming Paradigm

One feature of functional programming languages is that there are no variables, and the Python section supports functional programming paradigms, but not purely functional languages.

What is functional programming? Simple answer: Everything is a mathematical function. Functional programming languages can also have objects, but usually these objects are constant--or function parameters, what is the function return value. There is no For/next loop in functional programming languages, because these logic implies a state change. Instead, the cyclic logic is implemented in a functional programming language by recursion and by passing functions as parameters.

There is a better argument for why functional programming is used, and modern applications involve parallel computing functions on multicore computers, and the state of the program becomes a problem. All imperative languages, including object-oriented languages, encounter state modification issues with shared objects when multi-threading is involved. This is the root cause of the deadlock, stack trace, low-level processor cache hit ratio, and so on. If the object has no state, these problems do not exist.

Functional programming can solve the state problem of parallel operation, but the cost is to lose human readability.

Functional Programming Paradigm