checkpoint1

04week/README.md

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+'use strict';
+
+const assert = require('assert');
+const readline = require('readline');
+const rl = readline.createInterface({
+  input: process.stdin,
+  output: process.stdout
+});
+
+let stacks = {
+  a: [4, 3, 2, 1],
+  b: [],
+  c: [],
+};
+
+function printStacks() {
+  console.log("a: " + stacks.a);
+  console.log("b: " + stacks.b);
+  console.log("c: " + stacks.c);
+}
+
+// Take the last element of the starting array and add it to the last part of the ending array
+function movePiece(startStack, endStack) {
+    stacks[endStack].push(stacks[startStack].pop());
+}
+
+
+// Compare the size of the last element of the starting and ending array
+function isLegal(startStack, endStack) {
+// Allow a move if the array is empty as a special condition
+  if (stacks[endStack].slice(-1)==""){
+    return true;
+// Allow a move if the number of the ending array is smaller than the size of the starting array
+  } else if (stacks[endStack].slice(-1) > stacks[startStack].slice(-1)) {
+    moves = moves + 1;
+    return true;
+  } else {
+    return false;
+  }
+};
+
+// Check to see if the b or c array has the winning arrangement. Array a does not count towards a win.
+//loop thru object array
+let winStack = [4, 3, 2, 1];
+let gameOver = false;
+//check to see if the object property values equal a winning array of [4,3,2,1]
+function arraysEqual(arr1, arr2) {
+    if(arr1.length !== arr2.length)
+        return false;
+    for(var i = arr1.length; i--;) {
+        if(arr1[i] !== arr2[i])
+            return false;
+    }
+    return true;
+}
+
+function checkForWin() {
+    //if the function that determined whether the array contents are equal is true, comparing it to winStack, proceed
+  if (arraysEqual(stacks.b, winStack) || arraysEqual(stacks.c, winStack)) {
+    console.log("you're a winner!");
+    gameOver = true;
+    return true;
+  } else {
+    return false;
+  }
+}
+
+
+function towersOfHanoi(startStack, endStack) {
+    //first check for win
+    checkForWin();
+    //if check for win is false, continue with moves
+        if (!gameOver) {
+            //make sure it's a legal move
+        if (isLegal(startStack, endStack) == true) {
+            movePiece(startStack, endStack);
+        }
+    } else {
+        //if you won, don't allow a move and instead log a winning sentence
+        console.log("You win!");
+    }
+}
+
+function getPrompt() {
+  printStacks();
+  rl.question('start stack: ', (startStack) => {
+    rl.question('end stack: ', (endStack) => {
+      towersOfHanoi(startStack, endStack);
+      getPrompt();
+    });
+  });
+}
+
+// Tests
+if (typeof describe === 'function') {
+  describe('#towersOfHanoi()', () => {
+    it('should be able to move a block', () => {
+      towersOfHanoi('a', 'b');
+      assert.deepEqual(stacks, { a: [4, 3, 2], b: [1], c: [] });
+    });
+  });
+
+  describe('#isLegal()', () => {
+    it('should not allow an illegal move', () => {
+      stacks = {
+        a: [4, 3, 2],
+        b: [1],
+        c: []
+      };
+      assert.equal(isLegal('a', 'b'), false);
+    });
+    it('should allow a legal move', () => {
+      stacks = {
+        a: [4, 3, 2, 1],
+        b: [],
+        c: []
+      };
+      assert.equal(isLegal('a', 'c'), true);
+    });
+  });
+  describe('#checkForWin()', () => {
+    it('should detect a win in stack b', () => {
+      stacks = { a: [], b: [4, 3, 2, 1], c: [] };
+      assert.equal(checkForWin(), true);
+      stacks = { a: [1], b: [4, 3, 2], c: [] };
+      assert.equal(checkForWin(), false);
+    });
+    //sepcifically check if stack c is a winner
+    it('should detect a win in stack c', () => {
+        stacks = { a: [], b: [], c: [4, 3, 2, 1] };
+        assert.equal(checkForWin(), true);
+        stacks = { a: [1], b: [4, 3, 2], c: [] };
+        assert.equal(checkForWin(), false);
+      });
+      //specifically check to see that stack a cannot trigger a win
+      it('should not detect a win in stack a', () => {
+        stacks = { a: [4, 3, 2, 1], b: [], c: [] };
+        assert.equal(checkForWin(), false);
+        stacks = { a: [], b: [4, 3, 2, 1], c: [] };
+        assert.equal(checkForWin(), true);
+      });
+      //make sure the game is over once a winner is chosen
+    it('should end game once won, ()', () => {
+        stacks = { a: [], b: [4, 3, 2, 1], c: [] };
+        assert.equal(gameOver, true);
+      });
+  });
+} else {
+  getPrompt();
+}

04week/towersOfHanoi.js

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+**
+'use strict';
+
+const assert = require('assert');
+const readline = require('readline');
+const rl = readline.createInterface({
+  input: process.stdin,
+  output: process.stdout
+});
+
+let stacks = {
+  a: [4, 3, 2, 1],
+  b: [],
+  c: [],
+};
+
+function printStacks() {
+  console.log("a: " + stacks.a);
+  console.log("b: " + stacks.b);
+  console.log("c: " + stacks.c);
+}
+
+// Take the last element of the starting array and append it to the last of the ending array
+function movePiece(startStack, endStack) {
+    stacks[endStack].push(stacks[startStack].pop());
+}
+
+
+// Compare the size of the last element of the starting and ending array
+function isLegal(startStack, endStack) {
+// Allow a move if the array is empty as a special condition
+  if (stacks[endStack].slice(-1)==""){
+    return true;
+// Allow a move if the number of the ending array is smaller than the size of the starting array
+  } else if (stacks[endStack].slice(-1) > stacks[startStack].slice(-1)) {
+    return true;
+  } else {
+    return false;
+  }
+};
+
+// Check to see if the b or c array has the winning arrangement. Array a does not count towards a win.
+//loop thru object array
+let winStack = [4, 3, 2, 1];
+let gameOver = false;
+function arraysEqual(arr1, arr2) {
+    if(arr1.length !== arr2.length)
+        return false;
+    for(var i = arr1.length; i--;) {
+        if(arr1[i] !== arr2[i])
+            return false;
+    }
+    return true;
+}
+
+function checkForWin() {
+  if (arraysEqual(stacks.b, winStack) || arraysEqual(stacks.c, winStack)) {
+    console.log("you're a winner!");
+    gameOver = true;
+    return true;
+  } else {
+    return false;
+  }
+}
+
+
+function towersOfHanoi(startStack, endStack) {
+    checkForWin();
+    if (!gameOver) {
+        if (isLegal(startStack, endStack) == true) {
+            movePiece(startStack, endStack);
+        }
+    } else {
+        console.log("You win!");
+    }
+}
+
+function getPrompt() {
+  printStacks();
+  rl.question('start stack: ', (startStack) => {
+    rl.question('end stack: ', (endStack) => {
+      towersOfHanoi(startStack, endStack);
+      getPrompt();
+    });
+  });
+}
+
+// Tests
+if (typeof describe === 'function') {
+  describe('#towersOfHanoi()', () => {
+    it('should be able to move a block', () => {
+      towersOfHanoi('a', 'b');
+      assert.deepEqual(stacks, { a: [4, 3, 2], b: [1], c: [] });
+    });
+  });
+
+  describe('#isLegal()', () => {
+    it('should not allow an illegal move', () => {
+      stacks = {
+        a: [4, 3, 2],
+        b: [1],
+        c: []
+      };
+      assert.equal(isLegal('a', 'b'), false);
+    });
+    it('should allow a legal move', () => {
+      stacks = {
+        a: [4, 3, 2, 1],
+        b: [],
+        c: []
+      };
+      assert.equal(isLegal('a', 'c'), true);
+    });
+  });
+  describe('#checkForWin()', () => {
+    it('should detect a win in stack b', () => {
+      stacks = { a: [], b: [4, 3, 2, 1], c: [] };
+      assert.equal(checkForWin(), true);
+      stacks = { a: [1], b: [4, 3, 2], c: [] };
+      assert.equal(checkForWin(), false);
+    });
+    it('should detect a win in stack c', () => {
+        stacks = { a: [], b: [], c: [4, 3, 2, 1] };
+        assert.equal(checkForWin(), true);
+        stacks = { a: [1], b: [4, 3, 2], c: [] };
+        assert.equal(checkForWin(), false);
+      });
+      it('should not detect a win in stack a', () => {
+        stacks = { a: [4, 3, 2, 1], b: [], c: [] };
+        assert.equal(checkForWin(), false);
+        stacks = { a: [], b: [4, 3, 2, 1], c: [] };
+        assert.equal(checkForWin(), true);
+      });
+    it('should end game once won, ()', () => {
+        stacks = { a: [], b: [4, 3, 2, 1], c: [] };
+        assert.equal(gameOver, true);
+      });
+  });
+} else {
+  getPrompt();
+}