Shane Perera shanecp

## System Design.md

      
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                System Design Cheatsheet
              
          
    System Design Cheatsheet


Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps


Clarify and agree on the scope of the system


User cases (description of sequences of events that, taken together, lead to a system doing something useful)

Who is going to use it?
How are they going to use it?


## gist:3180103
/**
 * Generates the string for the Haversine function. We assume that the `zipcode`, `latitude`,
 * and `longitude` columns are named accordingly. We are also not doing much error-checking
 * here; this is a simple text cruncher to make things prettier.
 * We may also be integrating some extra SQL in, passed in via the $extra parameter
 *
 * @param   string      $table      The table to search in
 * @param   float       $lat        The latitude part of the reference coordinates
 * @param   float       $lng        The longitude part of the reference coordinates
 * @param   int         $radius     The radius to search within

## gist:2999707
<!doctype html>
<title>Site Maintenance</title>
<style>
  body { text-align: center; padding: 150px; }
  h1 { font-size: 50px; }
  body { font: 20px Helvetica, sans-serif; color: #333; }
  article { display: block; text-align: left; width: 650px; margin: 0 auto; }
  a { color: #dc8100; text-decoration: none; }
  a:hover { color: #333; text-decoration: none; }
</style>
	/**
	* Generates the string for the Haversine function. We assume that the `zipcode`, `latitude`,
	* and `longitude` columns are named accordingly. We are also not doing much error-checking
	* here; this is a simple text cruncher to make things prettier.
	* We may also be integrating some extra SQL in, passed in via the $extra parameter
	*
	* @param string $table The table to search in
	* @param float $lat The latitude part of the reference coordinates
	* @param float $lng The longitude part of the reference coordinates
	* @param int $radius The radius to search within
	<!doctype html>
	<title>Site Maintenance</title>
	<style>
	body { text-align: center; padding: 150px; }
	h1 { font-size: 50px; }
	body { font: 20px Helvetica, sans-serif; color: #333; }
	article { display: block; text-align: left; width: 650px; margin: 0 auto; }
	a { color: #dc8100; text-decoration: none; }
	a:hover { color: #333; text-decoration: none; }
	</style>