[Functional Programming] #react #js

functional-programming.txt

Procedural Programming

###### Pure function 
- function that does not rely on data outside of its scope. Just does itself. No side effects.
- one output 
- if it manipulates a global variable, it is impure (copy list into new variable, output that 
- take an argument, make it newVariable, modify, output

{ robot.name = "Sean"} is a "reference"  <- this will modify a global variable
{ robot = { name: "Sean" } } is "pass by value" <- this will not leave scope

" = Higher Order function = Function within a function

# type Array.prototype.   in console to see a list of functions

MAP