Gets the number of elements in the heap.

Gets the element compare func, which is the func to compare two elements based on the heap type: the function returns true if the first element is indeed the correct parent of the second element or false if not.

Gets a value indicating whether this instance is a min heap (true) or a max heap (false)

Gets the key compare func to compare elements based on key.

Gets the root of the heap. Depending on the fact if this is a min or max heap, it returns the element with the minimum key (min heap) or the element with the maximum key (max heap). If the heap is empty, null / default is returned