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3: Invoking Functions - Coggle Diagram

- - - - by the JavaScript engine
    - - by the code
- - - - > Window {window: Window...} > 3 > (2) {0: 3, 1: 4} > 3
      - where
        
        this
        
        points to the global object #
        
        in the browser this is the window
        
        because the function
        
        is executed in the global space
        
        arguments
        
        is an array-like value
        
        it's NOT an array
        
        you can't use all the methods you would get with an array
        
        but it functions like one
        
        why would you use this?
        
        let sum = function() { let sum = 0; for (let i = 0; i < arguments.length; i++) { sum += arguments[i] } console.log(sum) } sum(1,2,3,4,5,6)
        
        you don't know how many arguments it'll be called with
- - - - the function is attached to an object
    - - with the new keyword