Functional Programming

Functional Programming Concepts

1. What is functional programming?

Functional programming is a programming paradigm — a style of building the structure and elements of computer programs — that treats computation as the evaluation of mathematical functions and avoids changing-state and mutable data

2. What is a pure function and how do we know if something is a pure function?

• It returns the same result if given the same arguments (it is also referred as deterministic)
• It does not cause any observable side effects

3. What are the benefits of a pure function?

The code’s definitely easier to test. We don’t need to mock anything.

4. What is immutability?

When data is immutable, its state cannot change after it’s created. If you want to change an immutable object, you can’t. Instead, you create a new object with the new value.

5. What is Referential transparency?

Basically, if a function consistently yields the same result for the same input, it is referentially transparent.

Node JS Tutorial for Beginners #6 - Modules and require()

1. What is a module?

Another JavaScript file

2. What does the word ‘require’ do?

It allows us to include modules that exist in separate files. It reads a JavaScript file, executes the file and then returns the exports object.