Pass hex into initializing function

src/hexgrid.ts

@@ -1,7 +1,7 @@
 export class Hex<T = void> {
  private readonly parent: HexGrid<T>;
- private readonly x: number;
- private readonly y: number;
+ readonly x: number;
+ readonly y: number;
  content: T | undefined;
 
  constructor(parent: HexGrid<T>, x: number, y: number) {
@@ -21,13 +21,13 @@ export class HexGrid<T = void> {
  constructor(
  width: number,
  height: number,
- initializeFn?: () => T,
+ initializeFn?: (hex: Hex<T>) => T,
  ) {
  this.hexArray = Array.from(new Array(height))
  .map((_, y) => Array.from(new Array(width))
  .map((_, x) => {
  const hex = new Hex(this, x, y);
- hex.content = initializeFn ? initializeFn() : undefined;
+ hex.content = initializeFn ? initializeFn(hex) : undefined;
  return hex;
  }));
  }

tests/hexgrid.spec.ts

@@ -161,6 +161,20 @@ describe('a hex grid', () => {
  expect(grid.at(0, 0).content).to.eql(thing);
  }));
  });
+
+ it('passes the initializing hex to the initialize function', () => {
+ const grid = new HexGrid<string>(3, 3, (hex) => `${hex.x},${hex.y}`);
+
+ expect(grid.at(0, 0).content).to.eql('0,0');
+ expect(grid.at(1, 0).content).to.eql('1,0');
+ expect(grid.at(2, 0).content).to.eql('2,0');
+ expect(grid.at(0, 1).content).to.eql('0,1');
+ expect(grid.at(1, 1).content).to.eql('1,1');
+ expect(grid.at(2, 1).content).to.eql('2,1');
+ expect(grid.at(0, 2).content).to.eql('0,2');
+ expect(grid.at(1, 2).content).to.eql('1,2');
+ expect(grid.at(2, 2).content).to.eql('2,2');
+ });
  });
 });