example.js in trackler-2.2.1.21

- old
+ new

@@ -1,12 +1,36 @@
-const W = 8,
-  H = 8,
-  STARTING = { black: [7, 3], white: [0, 3] };
+const W = 8;
+const H = 8;
+const STARTING = { black: [7, 3], white: [0, 3] };
 
+function samePosition({ white, black }) {
+  return white[0] === black[0] && white[1] === black[1];
+}
+
+function buildRow(cell, colCount) {
+  return Array(...Array(colCount)).map(() => cell);
+}
+
+function concatRows(row, rowCount) {
+  return [...Array.prototype.concat.apply(buildRow(row, rowCount)).join('')];
+}
+
+function constructBoard() {
+  let row = buildRow('_ ', W).join('');
+  row = `${row.substring(0, row.length - 1)}\n`;
+  return concatRows(row, H);
+}
+
+function placePieces(self) {
+  const board = self.board;
+  board[(self.black[0] * W * 2) + (self.black[1] * 2)] = 'B';
+  board[(self.white[0] * W * 2) + (self.white[1] * 2)] = 'W';
+}
+
 const QueenAttack = (params = STARTING) => {
   const self = this instanceof QueenAttack ? this : Object.getPrototypeOf(QueenAttack);
-  if (params && params.white === params.black) {
+  if (samePosition(params)) {
     throw new Error('Queens cannot share the same space');
   }
 
   self.black = params.black;
   self.white = params.white;
@@ -22,26 +46,7 @@
 
   self.toString = () => self.board.join('');
 
   return self;
 };
-
-function constructBoard() {
-  let row = buildRow('_ ', W).join('');
-  row = `${row.substring(0, row.length - 1)}\n`;
-  return concatRows(row, H);
-}
-
-function placePieces(self) {
-  self.board[self.black[0] * W * 2 + self.black[1] * 2] = 'B';
-  self.board[self.white[0] * W * 2 + self.white[1] * 2] = 'W';
-}
-
-function buildRow(cell, colCount) {
-  return Array(...Array(colCount)).map(() => cell);
-}
-
-function concatRows(row, rowCount) {
-  return [...Array.prototype.concat.apply(buildRow(row, rowCount)).join('')];
-}
 
 export default QueenAttack;