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Diffstat (limited to 'src')
| -rw-r--r-- | src/content/chapter2_flow_control/lesson09_guards/code.gleam | 15 | ||||
| -rw-r--r-- | src/content/chapter2_flow_control/lesson09_guards/text.html | 9 |
2 files changed, 24 insertions, 0 deletions
diff --git a/src/content/chapter2_flow_control/lesson09_guards/code.gleam b/src/content/chapter2_flow_control/lesson09_guards/code.gleam new file mode 100644 index 0000000..3744228 --- /dev/null +++ b/src/content/chapter2_flow_control/lesson09_guards/code.gleam @@ -0,0 +1,15 @@ +import gleam/io + +pub fn main() { + let numbers = [1, 2, 3, 4, 5] + io.debug(get_first_larger(numbers, 3)) + io.debug(get_first_larger(numbers, 5)) +} + +fn get_first_larger(lists: List(Int), limit: Int) -> Int { + case lists { + [first, ..] if first > limit -> first + [_, ..rest] -> get_first_larger(rest, limit) + [] -> 0 + } +} diff --git a/src/content/chapter2_flow_control/lesson09_guards/text.html b/src/content/chapter2_flow_control/lesson09_guards/text.html new file mode 100644 index 0000000..3ea9cc5 --- /dev/null +++ b/src/content/chapter2_flow_control/lesson09_guards/text.html @@ -0,0 +1,9 @@ +<p> + The <code>if</code> keyword can be used with case expressions to add a + <em>guard</em> to a pattern. A guard is an expression that must evaluate to + <code>True</code> for the pattern to match. +</p> +<p> + Only a limited set of operators can be used in guards, and functions cannot be + called at all. +</p> |