January 20 - How to Check if a Value Exists in a Set of Nested Hashes in Ruby
This coding exercise extends our knowledge on the Hash data structure and walks through how to check and see if a value exists in any number of Hash collections nested inside an array.
Guide Tasks
- Read Tutorial
- Watch Guide Video
- Complete the Exercise
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Summary
Build a method that looks through an array of hashes to see if a value exists anywhere inside of one of the hashes.
Exercise Description
In order to properly pass this coding exercise you'll need to open up Ruby's Array class and add a method called value_included? that iterates through the array of hashes and returns true if a value exists inside any of the hash values and false if the value is not found.
Example Data
books = [
{
:title => 'Fountainhead',
:author => 'Ayn Rand'
},
{
:title => 'Deep Work',
:author => 'Cal Newport'
}
]
Example Process
books.value_included? 'Deep Work' # true books.value_included? 'Something that does not exist' # false
Real World Usage
This exercise shows you how to work with nested collections. This is particularly useful when working with API data that includes nested data that needs to be accessed.