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diff --git a/lessons/src/lesson026_list_recursion/text.html b/lessons/src/lesson026_list_recursion/text.html new file mode 100644 index 0000000..7f2351d --- /dev/null +++ b/lessons/src/lesson026_list_recursion/text.html @@ -0,0 +1,22 @@ +<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> + |