# Reviewing Arrays and Hashes

## Assignment
1. Describe an array. Give an example of a problem that you might use an array to solve.
2. Describe a Ruby hash. Give an example of a problem that you might use a Ruby hash to solve.
3. For each of the following, determine if you would use an array, a hash, or a combination of the two to solve the problem. Use your descriptions in #1 and #2 to justify your answer.
  - Count the frequency of letters used in a set of text.
  - Record attendance for 24 students for one day.
  - Track information for a single student (name, id, and address).
  - Track attendance for a cohort at Ada.
  - Track deposit and withdrawl amounts from a [petty cash fund](https://en.wikipedia.org/wiki/Petty_cash).
  - Represent a player's hand in [Texas Hold'em Poker](https://en.wikipedia.org/wiki/Texas_hold_%27em).
  - Represent a player's hand in [Go Fish](https://en.wikipedia.org/wiki/Go_Fish).
