reading-notes

🗒️ Class 09 Functional Programming

• What is functional programming?

  A style of programming that emphasizes the use of functions and avoids changing-state and mutable data.

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

  A pure function is a function that adheres to the strict deifintions of purity. A pur function must return the same result if give the same argument and caannot cause any observable side effects.

• What are the benefits of a pure function?

  Pure functions are easier to test.

• What is immutability?

  Immutability means cannot be change or cant be changed over time.

• What is Referential transparency?

  Referential transparency occurs when a function consistently yeilds the same results for the same input. pure functions + immutable data = referential transparency

Videos

• What is a module?

  A self-contained block of code that has a certain functionality that can be called on when needed anywhere during the code.

• What does the word ‘require’ do?

  Its used to load specify what module we want to bring into our working file and from what path the module is located at.

• How do we bring another module into the file the we are working in?

  By using var <variable> = require('./path to file/filename')

• What do we have to do to make a module available?

  Explicityly say what part of the module we want to make available outside by using module.exports = <module name>;