Hartley Brody hartleybrody

## Bitwise Operators.md

      
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                hartleybrody
                / Bitwise Operators.md
            
            
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              August 29, 2015 13:57
            
              
                While learning about XORs during a basic crypto class, I decided to take a side track and learn about a term that was always shrouded in mystery -- bitwise operators. As always, I wrote these as my own notes for later reference but I'm publishing them here in case they help other people. Happy to accept pull requests for corrections.
              
          
    (A bit of a tangent from crypto 101)
Bits and bytes


Core contepts:

Bitwise operators work on bits.
Bits are used to express data in binary form.
Bits can have a value of either 1 (ie TRUE) or 0 (ie FALSE).


Higher-level language constructs like floats and strings can all be represented as a series of bytes


1 byte = 8 bits


## Javascript Variable Scoping.md

      
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                hartleybrody
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              February 3, 2019 19:13
            
              
                Variable scoping in Javascript can be confusing so I set out to make notes of the basic rules so that I can reference them later. Hope these are useful to others, happy to talk pull requests for corrections.
              
          
    Javascript has two kinds of scope:

Local (inside a function)
Global (outside a function)

The var Keyword


Using the var keywords creates the variable in the current scope

If the current scope is global, then var is unnecessary (see below)
If the current scope is local, then you’re creating a local variable in the current scope


If you don’t use var, then Javascript goes up the “scope chain” to see if it’s already been declared


## new-tab.js
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