Use TS optional chaining (#11)

Author: cscleison

.gitignore

@@ -1 +1,2 @@
-node_modules
+node_modules
+.vscode

src/load-game.ts

@@ -2,7 +2,7 @@ import gameSettings from "../settings/game.json";
 import { Board, checkTile, isOutOfBounds, Turtle } from "./board";
 import { Tile } from "./navigation";
 
-const parseTile = (tile: Tile) => Boolean(tile && tile.x >= 0 && tile.y >= 0);
+const parseTile = (tile: Tile) => Boolean(tile?.x >= 0 && tile?.y >= 0);
 
 const getBoard = ({
   xLength,
@@ -15,8 +15,7 @@ const getBoard = ({
       xLength > 0 &&
         yLength > 0 &&
         parseTile(exit) &&
-        mines &&
-        mines.length &&
+        mines?.length &&
         mines.every(parseTile)
     )
   ) {

src/load-moves.ts

@@ -2,9 +2,7 @@ import movesSettings from "../settings/moves.json";
 import { Action } from "./board";
 
 const isValid = (sequence: Action[]) =>
-  Boolean(
-    sequence && sequence.length && sequence.every(a => a === "m" || a === "r")
-  );
+  Boolean(sequence?.length && sequence.every(a => a === "m" || a === "r"));
 
 export const loadMoves = () => {
   if (!movesSettings) {