Check out example codes for "ruby get valeu from hash". It will help you in understanding the concepts better.

Code Example 1

To get a specific value from a hash you can use the following methods:

hash = {:key1 => "value1", 'key2' => "value2"}

Getting by a symbol:
hash[:key1]

or

Getting by a string:
hash['key2']

or 

Getting by string or symbol:
Obs.: HashWithIndifferentAccess is part of rails active_support gem so this option only works on a Rails project or using the active_support gem:

hash = HashWithIndifferentAccess.new({:key1 => "value1", :key2 => "value2"})
hash[:key1]  # "value1"
hash['key1'] # "value1"

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