Functional Programming

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Functional Programming Concepts
Node JS Tutorial for Beginners - Modules and Require()

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 - Wikipedia
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?
   • Easier to test
4. What is immutability?
   • Unchanging over time or unable to be changed. When data is immutable, its state cannot change after it’s created.
5. What is Referential transparency?
   • Basically, if a function consistently yields the same result for the same input, it is referentially transparent.
   • pure functions + immutable data = referential transparency

Node JS Tutorial for Beginners - Modules and Require()

1. What is a module?
   • Snipits of single functions/behaviors. Small bits of codues that are simply small javascript files.
2. What does the word ‘require’ do?
   • Essentially it imports in another file
3. How do we bring another module into the file the we are working in?
   • var variable = require('./file');
4. What do we have to do to make a module available?
   • module.exports = function;

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