September Morn Update

Task/Fibonacci-sequence/Rust/fibonacci-sequence-3.rust

@@ -1,14 +1,7 @@
-#![feature(conservative_impl_trait)]
-
-fn main() {
-    for num in fibonacci_gen(10) {
-        println!("{}", num);
+fn fib(n: u32) -> u32 {
+    match n {
+        0 => 0,
+        1 => 1,
+        n => fib(n - 1) + fib(n - 2),
     }
 }
-
-fn fibonacci_gen(terms: i32) -> impl Iterator<Item=u64> {
-    let sqrt_5 = 5.0f64.sqrt();
-    let p  = (1.0 + sqrt_5) / 2.0;
-    let q = 1.0/p;
-    (1..terms).map(move |n| ((p.powi(n) + q.powi(n)) / sqrt_5 + 0.5) as u64)
-}

Task/Fibonacci-sequence/Rust/fibonacci-sequence-4.rust

@@ -1,29 +1,14 @@
-use std::mem;
-
-struct Fib {
-    prev: usize,
-    curr: usize,
-}
-
-impl Fib {
-    fn new() -> Self {
-        Fib {prev: 0, curr: 1}
-    }
-}
-
-impl Iterator for Fib {
-    type Item = usize;
-    fn next(&mut self) -> Option<Self::Item>{
-        mem::swap(&mut self.curr, &mut self.prev);
-        self.curr.checked_add(self.prev).map(|n| {
-            self.curr = n;
-            n
-        })
-    }
-}
+#![feature(conservative_impl_trait)]
 
 fn main() {
-    for num in Fib::new() {
+    for num in fibonacci_gen(10) {
         println!("{}", num);
     }
 }
+
+fn fibonacci_gen(terms: i32) -> impl Iterator<Item=u64> {
+    let sqrt_5 = 5.0f64.sqrt();
+    let p  = (1.0 + sqrt_5) / 2.0;
+    let q = 1.0/p;
+    (1..terms).map(move |n| ((p.powi(n) + q.powi(n)) / sqrt_5 + 0.5) as u64)
+}

Task/Fibonacci-sequence/Rust/fibonacci-sequence-5.rust

@@ -0,0 +1,29 @@
+use std::mem;
+
+struct Fib {
+    prev: usize,
+    curr: usize,
+}
+
+impl Fib {
+    fn new() -> Self {
+        Fib {prev: 0, curr: 1}
+    }
+}
+
+impl Iterator for Fib {
+    type Item = usize;
+    fn next(&mut self) -> Option<Self::Item>{
+        mem::swap(&mut self.curr, &mut self.prev);
+        self.curr.checked_add(self.prev).map(|n| {
+            self.curr = n;
+            n
+        })
+    }
+}
+
+fn main() {
+    for num in Fib::new() {
+        println!("{}", num);
+    }
+}