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<p>
Most commonly functions in the
<a href="https://hexdocs.pm/gleam_stdlib/gleam/list.html"><code>gleam/list</code></a>
module are used to iterate across a list, but at times you may prefer
to work with the list directly.
</p>
<p>
Gleam doesn't have a looping syntax, instead iteration is done through
recursion and pattern matching.
</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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