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# how does the server know that |index| refers to numericals?

When the teacher adds index as a parameter, index automatically populates numbers from 0 to 4, but where does 0 to 4 come from?

Hey gene c! I'll try to answer this for you but I wasn't 100% sure which part of the video your question was about. I don't have access to the whole video so I may have missed where your question came from.

I saw this bit of code in the text below the video:

```<% 4.times do |index| %>
<p><%= index %> fish</p>
<% end %>
```

If this bit of code is what your question was about or if this example is close to what your question is about, I should be able to answer.

The main part of this bit of code is centered around the `times` method. The `times` method allows you to do a loop a set number of times. So the code in the block portion gets executed `X` number of times but in this case, `4` times. The `|index|` portion of the code is a bit arbitrary as it could be named anything you want, just in this case it is named `index`. So `index` will refer to where in the loop the code is currently, 0, 1, 2, or 3. When you first start the loop, the code will begin with `0` then work its way to `3`, executing the code inside the block a total of 4 times.

I hope that helps, if not please let me know!