Use number as hash key


money = {1 => "$1,000,000", 2 => "$500,000"}
puts money[1]

1.	Return an array containing all the keys in a hash with keys:
2.	Extract data from the hash by using its keys.
3.	Retrieving Keys
4.	Join hash keys together
5.	RuntimeError: hash modified during iteration
6.	Get all keys from a hash
7.	Time value key
8.	Searching a Hash with Regular Expressions
9.	What if a key does not exist
10.	Hash as a key

Use number as hash key : Hash Keys « Hash « Ruby