Programming Ruby 3.3

Arrays and Hashes

Ruby provides a few different ways to combine objects into collections. Most of the time, you’ll use two of them: Arrays and Hashes. An Array is a linear list of objects, you retrieve them via their index, which is the number of their place in the array, starting at zero for the first slot. A Hash is an association, meaning it’s a key/value store where each value has an arbitrary key, and you retrieve the value via that key. Both arrays and hashes grow as needed to hold new elements. Any particular array or hash can hold objects of differing types; you can have an array containing an integer, then a string, then a floating-point number, as we’ll see in a minute.

You can create and initialize a new array object using an array ...