Peakle is a tiny abstraction around lists that makes them more walkable. Peakle's constructor takes only one parameter, a list of values. var peakled = new Peakle([ 1, 2, 3 ]); By default, the current position is always at the first element. If the initial list is empty, then the current position is 'null'. Properties: * length: returns a number of elements in the underlying list. * current: returns a value of the current element. Methods: * next(): Moves to the next element and returns its value. * prev(): Moves to the previous element and returns its value. * peak(adv): Returns next element's value without moving its pointer. This method accepts an optional numeric parameter. Use it if you want to peak further. * move(index): Moves to the specified element. All methods return 'null' if they can't return a value. Example: var peakled = new Peakle([ 1, 2, 3 ]); peakled.current; // 1 peakled.peak(); // 2 peakled.peak(2); // 3 peakled.next(); // 2 peakled.peak(); // 3 peakled.peak(2); // null peakled.peak(-1); // 1 peakled.prev(); // 1 peakled.move(2); // 3