You could call it a bubble sort in a sorted array (O( n )) I guess. Except you're only looking at log n items. The splice is not more efficient. You need to move the entire array down one position to move a new element at the front. With a heap, you need to swap at most log n elements.
Google found me a good explanation of heaps. Look at the illustrations. It also explains storage of complete binary trees in an array.
Please do pick up a book or two on algorithms and data structures; this is stuff anyone who is serious about programming should know.
Makeshifts last the longest.
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