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<p>
While it is more common to use functions in the
<a href="https://hexdocs.pm/gleam_stdlib/gleam/list.html" target="_blank">
<code>gleam/list</code>
</a>
module to iterate across a list, at times you may prefer to work
with the list directly.
</p>
<p>
The <code>[first, ..rest]</code> pattern matches on a list with at least one
element, assigning the first element to the variable <code>first</code> and
the rest of the list to the variable <code>rest</code>. By using this pattern
and a pattern for the empty list <code>[]</code> a function can run code on
each element of a list until the end is reached.
</p>
<p>
This code sums a list by recursing over the list and adding each int to a
<code>total</code> argument, returning it when the end is reached.
</p>
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