[ya-day1] swimmer problem 1

lib/toGetClosestPoint/toGetClosestPoint.ts

@@ -7,60 +7,18 @@ export function toGetClosestPoint(
   sx: number,
   sy: number,
 ) {
-  let direction: Direction = "N";
+  let direction: Direction = "" as Direction;
 
-  const sectors: Record<Direction, number[]> = {
-    NW: [x1, y2],
-    N: [x1, y2],
-    NE: [x2, y2],
-    E: [x2, y2],
-    SE: [x2, y1],
-    S: [x1, y1],
-    SW: [x1, y1],
-    W: [x1, y2],
-  };
+  if (sx >= x1 && sx <= x2 && sy >= y2) direction = "N";
+  if (sx >= x2 && sy <= y2 && sy >= y1) direction = "E";
+  if (sx >= x1 && sx <= x2 && sy <= y1) direction = "S";
+  if (sx <= x1 && sy <= y2 && sy >= y1) direction = "W";
 
-  for (let key in sectors) {
-    const [x, y] = sectors[key];
+  if (sx <= x1 && sy >= y2) direction = "NW";
+  if (sx >= x2 && sy >= y2) direction = "NE";
 
-    if (sx <= x && sy >= y) {
-      direction = "NW";
-      break;
-    }
-    if (sx >= x && sy > y && sx <= x2) {
-      direction = "N";
-      break;
-    }
-    if (sx >= x && sy >= y) {
-      direction = "NE";
-      break;
-    }
-
-    if (sx >= x && sy <= y && sy >= y1) {
-      direction = "E";
-      break;
-    }
-
-    if (sx >= x && sy <= y && sx <= x2) {
-      direction = "S";
-      break;
-    }
-
-    if (sx >= x && sy <= y) {
-      direction = "SE";
-      break;
-    }
-
-    if (sy <= y && sx <= x) {
-      direction = "SW";
-      break;
-    }
-
-    if (sy <= y2 && sy >= y1 && sx <= x) {
-      direction = "W";
-      break;
-    }
-  }
+  if (sx <= x1 && sy <= y1) direction = "SW";
+  if (sx >= x2 && sy <= y1) direction = "SE";
 
   return direction;
 }