Please enable JavaScript.

Coggle requires JavaScript to display documents.

JavaScript - Coggle Diagram

- - - - act like a placeholder for the data we hope we get back from the web browser feature's background work
  - - - Parameter = the placeholder;
        Argument = the actual value that gets passed in;
      - Call stack = how we keep track of the function being called
      - When you execute a function => new execution context:
        
        A local memory = variable environment, where everything defined in the function is stored
        
        The thread of execution (we go through the code in the function line by line)
- - - - undefined vs. undeclared vs. uninitialized =>
        
        undeclared = it has never been created in any scope we have access to.
        
        undefined = we have a variable, but at the moment, it has no value
        
        uninitialized = temporal dead zone
      - undefined === undefined => true
    - - a symbol value is created by invoking the function Symbol, which dynamically produces an anonymous, unique value
    - - is a numeric data type that can represent integers in the arbitrary precision format.
  - - - a special kind of object with a numeric index