What are some examples of enumeration in Ruby?

What are some examples of enumeration in Ruby?

In Ruby, enumeration refers to the ability to iterate over collections. Here are a few examples:

1. Using each method to iterate over an array:

   [1, 2, 3].each do |number|
     puts number
   end
   

2. Using map to transform elements:

   doubled = [1, 2, 3].map { |number| number * 2 }
   puts doubled.inspect
   

3. Using select to filter elements:

   evens = [1, 2, 3, 4].select { |number| number.even? }
   puts evens.inspect
   

Would you like to see more examples or explanations?

Can you explain the map method in more detail?

Sure! The map method creates a new array containing the results of running the block once for every element in the original array. For example:

squared = [1, 2, 3].map { |number| number ** 2 }
puts squared.inspect

This will output [1, 4, 9]. It’s a great way to transform data!

What about the select method?

The select method returns a new array containing all elements of the original array for which the given block returns true. For example:

odds = [1, 2, 3, 4, 5].select { |number| number.odd? }
puts odds.inspect

This will output [1, 3, 5]. It’s useful for filtering data based on conditions!