Add coordinate utils

utils/coordinates.test.ts

@@ -1,5 +1,11 @@
 import { describe, expect, it } from 'bun:test';
-import { type Coordinate, inBounds, isCoordinateEqual } from './coordinates.ts';
+import {
+  type Coordinate,
+  findCoordsOfDigit,
+  getAdjacent,
+  inBounds,
+  isCoordinateEqual
+} from './coordinates.ts';
 
 describe('coordinates utils', () => {
   it('inBounds', () => {
@@ -30,4 +36,69 @@ describe('coordinates utils', () => {
     expect(isCoordinateEqual(b, b)).toBeTrue();
     expect(isCoordinateEqual(a, b)).toBeTrue();
   });
+
+  it('getAdjacent', () => {
+    const input = `0123
+1234
+8765
+9876`.split('\n');
+
+    const actualTopLeft = getAdjacent(input, 0, 0);
+
+    expect(actualTopLeft).toBeObject();
+    expect(Object.keys(actualTopLeft)).toHaveLength(8);
+    expect(actualTopLeft.top).toBeUndefined();
+    expect(actualTopLeft.topRight).toBeUndefined();
+    expect(actualTopLeft.right).toEqual('1');
+    expect(actualTopLeft.downRight).toEqual('2');
+    expect(actualTopLeft.down).toEqual('1');
+    expect(actualTopLeft.downLeft).toBeUndefined();
+    expect(actualTopLeft.left).toBeUndefined();
+    expect(actualTopLeft.topLeft).toBeUndefined();
+
+    const actualFirst7 = getAdjacent(input, 1, 2);
+
+    expect(actualFirst7).toBeObject();
+    expect(Object.keys(actualFirst7)).toHaveLength(8);
+    expect(actualFirst7.top).toEqual('2');
+    expect(actualFirst7.topRight).toEqual('3');
+    expect(actualFirst7.right).toEqual('6');
+    expect(actualFirst7.downRight).toEqual('7');
+    expect(actualFirst7.down).toEqual('8');
+    expect(actualFirst7.downLeft).toEqual('9');
+    expect(actualFirst7.left).toEqual('8');
+    expect(actualFirst7.topLeft).toEqual('1');
+  });
+
+  it('findCoordsOfDigit', () => {
+    const input = `0123
+1234
+8765
+9876`.split('\n');
+    const actualZero = findCoordsOfDigit(input, '0');
+
+    expect(actualZero).toBeArray();
+    expect(actualZero).toHaveLength(1);
+    actualZero.forEach((coord) => expect(coord).toBeArray());
+    actualZero.forEach((coord) => expect(coord).toBeArrayOfSize(2));
+    expect(actualZero[0]).toEqual([0, 0]);
+
+    const actualSeven = findCoordsOfDigit(input, '7');
+
+    expect(actualSeven).toBeArray();
+    expect(actualSeven).toHaveLength(2);
+    actualSeven.forEach((coord) => expect(coord).toBeArray());
+    actualSeven.forEach((coord) => expect(coord).toBeArrayOfSize(2));
+    expect(actualSeven[0]).toEqual([1, 2]);
+    expect(actualSeven[1]).toEqual([2, 3]);
+
+    const actualSevenRegex = findCoordsOfDigit(input, /7/g);
+
+    expect(actualSevenRegex).toBeArray();
+    expect(actualSevenRegex).toHaveLength(2);
+    actualSevenRegex.forEach((coord) => expect(coord).toBeArray());
+    actualSevenRegex.forEach((coord) => expect(coord).toBeArrayOfSize(2));
+    expect(actualSevenRegex[0]).toEqual([1, 2]);
+    expect(actualSevenRegex[1]).toEqual([2, 3]);
+  });
 });