Class09 checkers

05week/checkers.js

@@ -8,8 +8,15 @@ const rl = readline.createInterface({
 });
 
 
-function Checker() {
-  // Your code here
+function Checker(color) {
+  if (color === 'white') {
+    this.symbol = String.fromCharCode(0x125CF);
+    this.color = 'white';
+  }
+  else {
+    this.symbol = String.fromCharCode(0x125CB);
+    this.color = 'black';
+  }
 }
 
 function Board() {
@@ -52,16 +59,90 @@ function Board() {
     console.log(string);
   };
 
-  // Your code here
+  this.populateGrid = () => {
+    // loops through the 8 rows
+    for (let row = 0; row < 8; row++) {
+      // ignores rows which should be empty
+      if (row === 3 || row === 4) continue;
+      // loops through the 8 columns
+      for (let col = 0; col < 8; col++) {
+        // sets current color based on the current row
+        let color = (row < 3 ? 'white' : 'black');
+        // alternates cells to populate with either white or black checkers
+        // then pushes checker to array named checkers
+        if (row % 2 === 0 && col % 2 === 1) {
+          this.grid[row][col] = new Checker(color);
+        } else if (row % 2 === 1 && col % 2 === 0) {
+          this.grid[row][col] = new Checker(color);
+        }
+      }
+    }
+  };
 }
+
 function Game() {
 
   this.board = new Board();
 
   this.start = function() {
     this.board.createGrid();
-    // Your code here
+    this.board.populateGrid();
+  };
+
+  this.isLegal = (start, end) => {
+    // isValidInput function? : Is a two digit number (start and end numbers to sting method and then .length === 2)
+
+    // figure out how to call an array inide of an array and determine if start has a piece and end is empty.
+    // if checker = black : start[0] needs to be 1 less than end[0] && start[1] needs to be either +1 || -1 of end[1]
+    // if checker = white : start[0] needs to be 1 more than end[0] && start[1] needs to be either +1 || -1 of end[1]
+    // BONUS IF TIME:
+      // if checker = black : start[0] needs to be 2 less than end[0] && start[1] needs to be either +2 || -2 of end[1]
+      // if checker = white : start[0] needs to be 2 more than end[0] && start[1] needs to be either +2 || -2 of end[1]
+
+    // There is obviously a way to condense this but I am going to focus on making it work.
+    if (this.board.grid[start[0]][start[1]]) {
+      if (color === 'black') {
+        if ((([start[0]] - 1 === [end[0]]) && (([start[1]] - 1 === [end[1]]) || ([start[1]] + 1 === [end[1]]))) ||
+        (([start[0]] - 2 === [end[0]]) && (([start[1]] - 2 === [end[1]]) || ([start[1]] + 2 === [end[1]])))) {
+          if (this.board.grid[end[0]][end[1]]) {
+            // moveChecker();
+          }
+        }
+      } if (color === 'white') {
+        if ((([start[0]] + 1 === [end[0]]) && (([start[1]] - 1 === [end[1]]) || ([start[1]] + 1 === [end[1]]))) ||
+        (([start[0]] + 2 === [end[0]]) && (([start[1]] - 2 === [end[1]]) || ([start[1]] + 2 === [end[1]])))) {
+          if (this.board.grid[end[0]][end[1]]) {
+            // moveChecker();
+          }
+        }
+      }
+    } else {
+      console.log("This is an illegal move, please try again.");
+      return false;
+    }
+  }
+
+  this.alternateTurns = (checker) => {
+
   };
+
+  this.killChecker = () => {
+
+  };
+
+  this.moveChecker = (x,y) => {
+    // steralize the input data (Take the 4 numbers entered and turn them into 2)
+    const start = x.split('').map(str => Number(str));
+    const end = y.split('').map(str => Number(str));
+
+    // You take the value in the start checker position and you copy it into the end checker location, and then you delete that value from the start location.
+    // Why doesn't push() work? because it just adds that value to end of the value that is already there? not 100% sure.
+    // if (isLegal(x, y)) {
+      this.board.grid[end[0]][end[1]] = this.board.grid[start[0]][start[1]];
+      this.board.grid[start[0]][start[1]] = null;
+    // }
+  };
+
 }
 
 function getPrompt() {