1 files changed, 13 insertions, 16 deletions
diff --git a/src/chip8.rs b/src/chip8.rs
index eacc1e3..c1f78b7 100644
--- a/src/chip8.rs
+++ b/src/chip8.rs
@@ -135,24 +135,21 @@ impl Chip8 {
     }
 
     fn draw(&self) -> std::io::Result<()> {
-        let lines: String = std::iter::once("\x1B[2J\n")
-            .chain((0..HEIGHT).flat_map(|y| {
-                (0..WIDTH)
-                    .map(move |x| {
-                        let si = x + y * WIDTH;
-                        if self.screen[si as usize] == 0 {
-                            "░"
-                        } else {
-                            "█"
-                        }
-                    })
-                    .chain(std::iter::once("\n"))
-            }))
-            .collect();
-
         let stdout = std::io::stdout();
         let mut handle = stdout.lock();
-        handle.write_all(lines.as_bytes())?;
+        handle.write_all(b"\x1B[2J\n")?;
+        for y in 0..HEIGHT {
+            for x in 0..WIDTH {
+                let si = x + y * WIDTH;
+                let buf = if self.screen[si as usize] == 0 {
+                    "░".as_bytes()
+                } else {
+                    "█".as_bytes()
+                };
+                handle.write_all(buf)?;
+            }
+            handle.write_all(b"\n")?;
+        }
         handle.flush()
     }
 }