using_as solution

exercises/23_conversions/using_as.rs

@@ -1,12 +1,10 @@
-// Type casting in Rust is done via the usage of the `as` operator. Please note
+// Type casting in Rust is done via the usage of the `as` operator.
-// that the `as` operator is not only used when type casting. It also helps with
+// Note that the `as` operator is not only used when type casting. It also helps
-// renaming imports.
+// with renaming imports.
-//
-// The goal is to make sure that the division does not fail to compile and
-// returns the proper type.
 
 fn average(values: &[f64]) -> f64 {
     let total = values.iter().sum::<f64>();
+    // TODO: Make a conversion before dividing.
     total / values.len()
 }
 

solutions/23_conversions/using_as.rs

@@ -1 +1,24 @@
-// Solutions will be available before the stable release. Thank you for testing the beta version 🥰
+// Type casting in Rust is done via the usage of the `as` operator.
+// Note that the `as` operator is not only used when type casting. It also helps
+// with renaming imports.
+
+fn average(values: &[f64]) -> f64 {
+    let total = values.iter().sum::<f64>();
+    total / values.len() as f64
+    //                   ^^^^^^
+}
+
+fn main() {
+    let values = [3.5, 0.3, 13.0, 11.7];
+    println!("{}", average(&values));
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn returns_proper_type_and_value() {
+        assert_eq!(average(&[3.5, 0.3, 13.0, 11.7]), 7.125);
+    }
+}