Add more utils

utils/coordinates.ts

@@ -0,0 +1,25 @@
+export type Coordinate = [number, number];
+
+/**
+ * Returns a filter lambda to be used in array.filter() on a xy-Coordinate array (array of two number arrays).
+ * @param xMax Exclusive
+ * @param yMax Exclusive
+ * @param xMin Inclusive, defaults to 0
+ * @param yMin Inclusive, defaults to 0
+ */
+export function inBounds(xMax: number, yMax: number, xMin = 0, yMin = 0) {
+  return ([x, y]: Readonly<Coordinate>) =>
+    x >= xMin && x < xMax && y >= yMin && y < yMax;
+}
+
+/**
+ * Check the equality of two xy-coordinates. Checks both x and y independently for number equality.
+ * @param a xy-Coordinate, two number array
+ * @param b xy-Coordinate, two number array
+ */
+export function isCoordinateEqual(
+  a: Readonly<Coordinate>,
+  b: Readonly<Coordinate>
+): boolean {
+  return b[0] === a[0] && b[1] === a[1];
+}