function definition

JS creates functions by assigning variables to them, instead of defining new commands like Python

function syntax

var name=function(param){what the function does;};

parameters

stuff in parentheses when function is defined

arguments

stuff in parentheses when function is called

call

to execute the commands in a function

D.R.Y.

don't repeat yourself

return

saves but does not print the result of the function

scope

global or local

global

defined outside a function

local

defined inside a function and only applicable in that particular function

var

used to define the scope of a variable, can be used even on variables of the same name to leave a global variable unchanged