What is functional programming?
Functional programming is programming with a focus on functions. The concept is that the functions are trees of expressions for mapping values. This means not changing state and mutating data.
What is a pure function and how do we know if something is a pure function?
A pure funciton is a function that is repeatable. In otherwords, the same parameters will result in the same output, every time.
What are the benefits of a pure function?
The benefits of pure functions is predictable programming. This predictability makes testing much easier as a result.
What is immutability?
Immutability is being impervious to chanage.
What is Referential transparency?
Referential transparency is the combination of pure funcitons and immutible data.
Pure Functions + Immutible Data = Referential Transperency
What is a module?
A module is an exportable function.
What does the word ‘require’ do?
“Require” pulls in the specified module into another file.
How do we bring another module into the file the we are working in?
To bring a module in the following syntax is used:
const somemodule = require('./somefile');
What do we have to do to make a module available?
To make this module available, it must be exported in the specified module file.
module.exports = somemodule;
In what contexts is referential transparency considered standard? Is the goal to always use when possible?