Ruby Language Hashes
Introduction
A Hash is a dictionary-like collection of unique keys and their values. Also called associative arrays, they are similar to Arrays, but where an Array uses integers as its index, a Hash allows you to use any object type. You retrieve or create a new entry in a Hash by referring to its key.
Syntax
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{ first_name: "Noel", second_name: "Edmonds" }
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{ :first_name => "Noel", :second_name => "Edmonds" }
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{ "First Name" => "Noel", "Second Name" => "Edmonds" }
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{ first_key => first_value, second_key => second_value }
Remarks
Hashes in Ruby map keys to values using a hash table.
Any hashable object can be used as keys. However, it's very common to use a Symbol as it is generally more efficient in several Ruby versions, due to the reduced object allocation.
{ key1: "foo", key2: "baz" }
