What are advanced enumerators in Ruby?

What are advanced enumerators in Ruby?

Advanced enumerators in Ruby allow for more complex iteration over collections, enabling lazy evaluation and custom iteration.

Can you give me an example of using an enumerator?

Sure! You can create an enumerator using Enumerator.new and define how it iterates over elements. For example:

my_enum = Enumerator.new do |y|
  y << 1
  y << 2
  y << 3
end

my_enum.each { |num| puts num }

What is lazy evaluation in this context?

Lazy evaluation means that values are computed only when needed. In Ruby, this can be achieved with enumerators, allowing for efficient memory usage.

How do I convert an array to an enumerator?

You can convert an array to an enumerator using the to_enum method. For example:

array = [1, 2, 3]
enumerator = array.to_enum
enumerator.each { |num| puts num }