Maps

• maps allow you to store items in a manner similar to a dictionary
• can create a new type out of dictionary and add methods to it
• var dictionary = map[string]string{} or var dictionary = make(map[string]string)
• d[word] = definition adding or updating a key/value pair in the dictionary
• delete(d, word) to delete key word from dictionary d
• can create custom types, that implement the error interface
• improves reusability
• declare with const to make them immutable
• having specific errors gives better information about what went wrong