// Shuffles an array's elements in place. function shuffle (theArray) { for (var currentElement = 0; currentElement < theArray.length; currentElement++) { // Remember the value of the current element. var thisElementValue = theArray[currentElement]; // Pick a random index from the array. var randIdx = myRandom(0, theArray.length - 1); // Swap the element at randIdx with the current element. theArray[currentElement] = theArray[randIdx]; theArray[randIdx] = thisElementValue; } } // Returns an integer in the range minVal to maxVal, inclusive function myRandom (minVal, maxVal) { do { var r = Math.random(); // Keep picking a number until it is not 1. } while (r == 1); return minVal + Math.floor(r * (maxVal + 1 - minVal)); }