How do I create a set in Ruby that only contains unique elements?

How do I create a set in Ruby that only contains unique elements?

In Ruby, you can use the Set class from the set library to create a set that only contains unique elements. Here's how you can do it:

require 'set'

my_set = Set.new([1, 2, 2, 3])
puts my_set.inspect  # Output: #<Set: {1, 2, 3}>

This will automatically remove duplicates.

Can I add elements to the set after creating it?

Yes, you can add elements to a set using the add method. For example:

my_set.add(4)
puts my_set.inspect  # Output: #<Set: {1, 2, 3, 4}>

What happens if I try to add a duplicate element?

If you try to add a duplicate element, the set will ignore it. For example:

my_set.add(2)
puts my_set.inspect  # Output: #<Set: {1, 2, 3, 4}>

How can I convert a set back to an array?

You can convert a set back to an array using the to_a method:

array = my_set.to_a
puts array.inspect  # Output: [1, 2, 3, 4]