Data commit

Task/Sierpinski-triangle/Rust/sierpinski-triangle.rust

@@ -0,0 +1,36 @@
+use std::iter::repeat;
+
+fn sierpinski(order: usize) {
+    let mut triangle = vec!["*".to_string()];
+    for i in 0..order {
+        let space = repeat(' ').take(2_usize.pow(i as u32)).collect::<String>();
+
+        // save original state
+        let mut d = triangle.clone();
+
+        // extend existing lines
+        d.iter_mut().for_each(|r| {
+            let new_row = format!("{}{}{}", space, r, space);
+            *r = new_row;
+        });
+
+        // add new lines
+        triangle.iter().for_each(|r| {
+            let new_row = format!("{}{}{}", r, " ", r);
+            d.push(new_row);
+        });
+
+        triangle = d;
+    }
+
+    triangle.iter().for_each(|r| println!("{}", r));
+}
+fn main() {
+    let order = std::env::args()
+        .nth(1)
+        .unwrap_or_else(|| "4".to_string())
+        .parse::<usize>()
+        .unwrap();
+
+    sierpinski(order);
+}