checkpoint 1

03week/towersOfHanoi.js

@@ -1,5 +1,17 @@
 'use strict';
 
+//whiteboarding
+//getpromt to ask from which stack to move and where to.
+//if endstack is empty then move, if not then check legal
+//move has to be legal, (isLegal)
+//if start number is smaller than end number then move piece
+//if illegal move tell them and get prompt again
+//if legal, pop off of initial stack and push onto next stack (movePiece)
+//check for win
+//if not win, reprompt
+//if win, tell user you won, reset stack (stackReset)
+
+
 const assert = require('assert');
 const readline = require('readline');
 const rl = readline.createInterface({
@@ -17,27 +29,65 @@ function printStacks() {
   console.log("a: " + stacks.a);
   console.log("b: " + stacks.b);
   console.log("c: " + stacks.c);
-}
-
-function movePiece() {
-  // Your code here
-
-}
-
-function isLegal() {
-  // Your code here
+};
 
-}
+const movePiece = (startStack, endStack) => {
+  const start = stacks[startStack];
+  const end = stacks[endStack];
+  end.push(start.pop());
+};
 
-function checkForWin() {
-  // Your code here
+const isLegal = (startStack, endStack) => {
+  const SSLastNum = stacks[startStack][stacks[startStack].length-1];
+ const ESLastnum = stacks[endStack][stacks[endStack].length-1];
+ if (ESLastnum > SSLastNum) {
+   return true;
+ } else {
+   return false;
+ };
+};
 
-}
+const checkForWin = () => {
+  let checkWin = false;
+  const solution = [4, 3, 2, 1];
+  for (index = 0; index < 4; index++) {
+    if (stacks['c'][index] == solution[index]) {
+      checkWin = true;
+    } else {
+      checkWin = false;
+      break;
+    };
+  };
+  if(checkWin) {
+    return "You win!";
+  } else {
+    return "You suck";
+  };
+};
 
-function towersOfHanoi(startStack, endStack) {
-  // Your code here
+const resetStack = () => {
+  let stacks = {
+    a: [4, 3, 2, 1],
+    b: [],
+    c: []
+  };
+};
 
-}
+const towersOfHanoi = (startStack, endStack) => {
+  if (stacks[endStack].length == 0) {
+    movePiece(startStack, endStack);
+  } else {
+    if (isLegal(startStack, endStack)) {
+      movePiece(startStack, endStack);
+      if (checkForWin()) {
+        alert('Congrats!');
+        resetStack();
+      }
+    } else {
+      alert('Please enter a legal move')
+    } 
+  }
+};
 
 function getPrompt() {
   printStacks();
@@ -47,7 +97,7 @@ function getPrompt() {
       getPrompt();
     });
   });
-}
+};
 
 // Tests
 
@@ -80,8 +130,10 @@ if (typeof describe === 'function') {
   });
   describe('#checkForWin()', () => {
     it('should detect a win', () => {
-      stacks = { a: [], b: [4, 3, 2, 1], c: [] };
+      stacks = { a: [], b: [], c: [4, 3, 2, 1] };
       assert.equal(checkForWin(), true);
+      stacks = { a: [], b: [4, 3, 2, 1], c: [] };
+      assert.equal(checkForWin(), false);
       stacks = { a: [1], b: [4, 3, 2], c: [] };
       assert.equal(checkForWin(), false);
     });