1 files changed, 50 insertions, 0 deletions
diff --git a/functional/src/main.rs b/functional/src/main.rs
new file mode 100644
index 0000000..4fbc447
--- /dev/null
+++ b/functional/src/main.rs
@@ -0,0 +1,50 @@
+use std::thread;
+use std::time::Duration;
+
+struct Cacher<T>
+    where T: Fn(u32) -> u32
+{
+    calculation: T,
+    value: Option<u32>,
+}
+
+fn main() {
+    let simulated_user_specified_value = 10;
+    let simulated_random_number = 7;
+
+    generate_workout(
+        simulated_user_specified_value,
+        simulated_random_number
+    );
+}
+
+fn generate_workout(intensity: u32, random_number: u32) {
+    let expensive_closure = |num| {
+        println!("calculating slowly...");
+        thread::sleep(Duration::from_secs(2));
+        num
+    };
+
+    if intensity < 25 {
+        println!(
+            "Today, do {} pushups!",
+            expensive_closure(intensity)
+        );
+        println!(
+            "Next, do {} situps!",
+            expensive_closure(intensity)
+        );
+    }
+    else {
+        if random_number == 3 {
+            println!("Take a break today! Remember to stay hydrated!");
+        }
+        else {
+            println!(
+                "Today, run for {} minutes!",
+                expensive_closure(intensity)
+            );
+        }
+    }
+}
+