这个简单的方法在Rails助手中不起作用

Question

Hey guys I'm new to rails. I'm practice what I've learned today about rails helper and ruby blocks by writing this code:

in /apps/helpers/home_helper.rb

module HomeHelper
  def each(from, to, by)
    x = from
    while x <= to
      yield x
      x = x + by
    end
  end
end

in /apps/views/index.html.erb

<p><%= each(2,16,3){|x| x } %></p>

But after I run the server, and navigate to the localhost:3000/home/index nothing in there.

anybody tells me what did I do wrong? Thanks

Answer 1

As other people have said, there are better methods fro what you're trying to achieve built into ruby. Specifically the #step method:

2.step(16, 3) { |i| puts i }

Also note that your index.html.erb file should have been in apps/views/home .

Answer 2

You don't need to write that method. Do this instead:

<% [2, 16, 3].each do |n| %>
 <p><%= n %></p>
<% end %>

The reason for this, is that the method 'each' 1) is already a Ruby method on any Enumerable object and 2) it is poor practice to re-invent such a basic wheel.