February 13 - Build a Histogram of Integer Counts in Ruby
This guide examines how to build a histogram in Ruby that takes in an Array of integers and returns a Hash that counts the number of occurrences of each integer.
Guide Tasks
- Read Tutorial
- Watch Guide Video
- Complete the Exercise
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Summary
Build a histogram in Ruby that returns a hash.
Exercise Description
Given the following array of integers:
[1, 4, 1, 3, 2, 1, 4, 5, 4, 4, 5, 4]
Build out a method that generates a histogram in hash form where the key is the integer that is being counted, and the value is the number of occurrences.
Expected Output
{
1=>3,
4=>5,
3=>1,
2=>1,
5=>2
}
Real World Usage
Counting the number of occurrences of a value in a collection is a common practice. Imagine that you need to calculate the number of times that a user has commented on a friend's picture in a social media application.