lib/collections/Heap.js
function () {
            var heap = this.__heap,
                l = heap.length,
                ret;
            if (l) {
                ret = heap[0];
            }
            return ret ? ret.key : ret;
        }
function () {
            var heap = this.__heap,
                l = heap.length,
                ret;
            if (l) {
                ret = heap[0];
            }
            return ret ? ret.key : ret;
        }
function ( ) { var heap = this . __heap , l = heap . length , ret ; if ( l ) { ret = heap [ 0 ] ; } return ret ? ret . key : ret ; }
Gets the key of the root node without removing it.

@returns the key of the root
Gets the key of the root node without removing it .