adding macro examples

src/macros.rs

@@ -0,0 +1,32 @@
+
+#[macro_export]
+macro_rules! log {
+    ( $( $t:tt )* ) => {
+        web_sys::console::log_1(&format!( $( $t )* ).into());
+    }
+}
+
+#[macro_export]
+macro_rules! expr_stringer {
+    // This macro takes an expression of type `expr` and prints
+    // it as a string along with its result.
+    // The `expr` designator is used for expressions.
+    ($expression:expr) => {
+        // `stringify!` will convert the expression *as it is* into a string.
+        format!("{:?} = {:?}", stringify!($expression), $expression)
+    };
+    ($expression:literal) => {
+        format!("{:?} = {:?}", $expression, "Nothing")
+    };
+}
+
+#[macro_export]
+macro_rules! find_min {
+    // Base case:
+    ($x:expr) => ($x);
+    // `$x` followed by at least one `$y,`
+    ($x:expr, $($y:expr),+) => (
+        // Call `find_min!` on the tail `$y`
+        std::cmp::min($x, find_min!($($y),+))
+    )
+}

src/main.rs

@@ -3,6 +3,7 @@ use std::cmp::Ordering;
 use rand::Rng;
 
 mod iterate;
+mod macros;
 
 fn main() {
     basics();
@@ -17,6 +18,9 @@ fn main() {
 }
 
 fn basics() { 
+
+    println!("min: {}", find_min!(5, 6));
+
     // ! indicates a macro not a func
     println!("Enter a number: ");