about_array.rb

*Created an empty array with a size of 
zero
*<< sends element to array without    
 calling its element. 
*when you go backwards in array it   
 doesn't begin at element 0
*slicing array cuts off at elements in   
 this case 4 is at end of slice but not 5
*how many dots in range specify where  
 class range ends 
*you can slice with ranges
*pop/push add and subtract from end of   
 array
*unshift add to beginning of array

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