Ruby: How to create a custom iteration method for a Enumerator Object?

Lets say, we have an Array of Strings named words and I want to instantiate a special Enumerator on it which only counts Strings with the length != 3. Here is my proposal:

def words.n_each
  select{|x| x.length != 3}.each do |y|
    yield y
  end
end

e4 = words.enum_for(:n_each)
e4.each do |w|
  puts w
end

But there has to be a more smarter rubyish way to include the mechanics of the n_each method inside a codeblock at the time of instantiation of the Enumerator. But how?

>Solution :

Is lazy what you are looking for?

p e4 = ["aaa","c","foo","aaaa"].lazy.reject{|s| s.size == 3 } # => <Enumerator::Lazy: ["aaa", "c", "foo", "aaaa"]>:reject>

e4.each do |w|
  puts w
end

prints

c
aaaa