diff --git a/day3/src/main.rs b/day3/src/main.rs
index 9e89422..31ee0b7 100644
--- a/day3/src/main.rs
+++ b/day3/src/main.rs
@@ -71,7 +71,7 @@ impl Number {
         }
         numbers
     }
-    fn is_part(&self, grid: Grid) -> bool {
+    fn proximity_check(&self, grid: Grid, check: impl Fn(char, (usize, usize)) -> bool) -> bool {
         for digit_index in self.location.clone() {
             for xoff in [-1_i32, 0, 1] {
                 for yoff in [-1_i32, 0, 1] {
@@ -98,7 +98,7 @@ impl Number {
                         .unwrap_or_else(|_| panic!("bad xoff {xoff} at digit index {digit_index}"));
                     let x = digit_index.min(line.len() - 1);
                     let chr = line[x];
-                    if chr != '.' && !chr.is_ascii_digit() {
+                    if check(chr, (x, y)) {
                         return true;
                     }
                 }
@@ -106,4 +106,7 @@ impl Number {
         }
         false
     }
+    fn is_part(&self, grid: Grid) -> bool {
+        self.proximity_check(grid, |chr, _| chr != '.' && !chr.is_ascii_digit())
+    }
 }