Some if-let in RBE

rustbyexample/flow_control.d/if_let.rs

@@ -0,0 +1,25 @@
+fn main() {
+    let number = Some(7);
+    let letter: Option<i32> = None;
+    let emoticon: Option<i32> = None;
+
+    if let Some(i) = number {
+        println!("Matched {:?}!", i);
+    }
+
+    if let Some(i) = letter {
+        println!("Matched {:?}!", i);
+    } else {
+        println!("Didn't match a number. Let's go with a letter!");
+    }
+
+    let i_like_letters = false;
+
+    if let Some(i) = emoticon {
+        println!("Matched {:?}!", i);
+    } else if i_like_letters {
+        println!("Didn't match a number. Let's go with a letter!");
+    } else {
+        println!("I don't like letters. Let's go with an emoticon :)!");
+    }
+}

rustbyexample/flow_control.d/if_let2.rs

@@ -0,0 +1,27 @@
+enum Foo {
+    Bar,
+    Baz,
+    Qux(u32),
+}
+
+fn main() {
+    let a = Foo::Bar;
+    let b = Foo::Baz;
+    let c = Foo::Qux(100);
+
+    if let Foo::Bar = a {
+        println!("a is a foobar");
+    }
+
+    if let Foo::Bar = b {
+        println!("b is foobar");
+    }
+
+    if let Foo::Qux(value) = c {
+        println!("c is {}", value);
+    }
+
+    if let Foo::Qux(value @ 100) = c {
+        println!("c is one hundred (value: {:?})", value);
+    }
+}

rustbyexample/flow_control.d/if_let3.rs

@@ -0,0 +1,11 @@
+enum Foo {
+    Bar,
+}
+
+fn main() {
+    let a = Foo::Bar;
+
+    if let Foo::Bar = a {
+        println!("a is foobar");
+    }
+}