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#List 10 topics
#1. Recursion
#2. Pairing effectively
#3. Benchmarking
#4. Using Regex
#5. Using the zip method.
#6. When to use destructive methods effectively
#7. Loops- each, while, unless
#8. Using yield
#9. Writing in pseudocode. 

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#Array#map calls the passed block once for each element of the array it was called on. 
#It creates and return a new array containing the new values.

#Array#inject combines each element of an enumerator by applying the operation specified in the attached block or
#represented by an operator/method symbol (like +, -, /). If a block is specified, the block is passed an accumulator value 
#and the individual element. It then returns the value of memo.

#Array#select returns a new array containing all the elements of the passed array for which the passed block is true.

class Array