Introduction to Array and Hash
Explore the basics of Ruby's composite data types by learning how to use arrays and hashes. Understand key methods like collect, empty?, select, and any? to manipulate and query data. This lesson helps you practice organizing and accessing data efficiently using these essential Ruby structures.
In previous exercises, we used simple data types, such as strings and integers (called Fixnum prior to Ruby 2.4). There are also composite data types, which are a collection of other types. The most common composite data types are arrays and hashes. A variable of type array is like a list of objects. A variable of type hash is a dictionary-like lookup, where each value is stored against a key.
An array
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