How to make this javascript code using a matrix work with App Inventor to count matrix inversions?

[SteveJG]

Thanks to @TIMAI2 , the javascript solution is part of

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Slide Nine - *a sliding block puzzle game tutorial for App Inventor*

A JavaScript inversions algorithm now attempts to determine if a 3 x 3 sliding puzzle is solvable . The tool is now part of Slide Nine (SlideNine_solvable.aia ). I am not sure how robust the article algorithm is; it appears to be reliable. A forecast of solvability is automatically provided at the start of the puzzle. Also check if a move within a solvable puzzle leaves the puzzle still solvable or not. Use the 'S' button to find out if a move you just made still allows the puzzle to be…