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Types - Coggle Diagram

- - - - Historical bug!
        
        unset a regular value like a number
        
        var n = undefined
        
        unset an object
        
        var o = null
    - - subtype of the Object type
      - or callable Object
    - - a subtype, a special kind of Object with numeric indexing, and some specific methods attached to it!
  - - - Number.isNaN()
      - Object.is(value, NaN)
      - isNaN()
      - invalid number
      - The only value that isn't equal to itself
    - - to represent direction or a trend rate
      - Object.is(value, -0)
      - Math.sign(value)