Ruby - Hash Hashes

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Introduction

Ruby Hashes are maps, dictionaries.

Objects within a hash are given a key that points to them.

Inside hashes, there's no guaranteed order.

Here's a basic hash with two entries:

Demo

h = { 'A' => 'a', 'B' => 'b' }

The variable storing the hash is h, and it contains two entries, as you can prove: 

puts h.size # 2

You use square brackets to reference the element. For example: 

puts dictionary['A']

You can change values in hash: 

h['A'] = "aa" 
puts h['A']

Hash keys and values can be objects of any type.

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