Discussion on: Checking Sudoku with Functional JavaScript

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Replies for: There might be a better way to check for squares. Basically you are always getting the data and putting it in to 9 arrays. So at its simplest you w...

you could make this a bit better by just flattening the data and using a utility like lodash's groupBy. Then you can do something like withIndexAsXY = (fn, index) => fn(index % 9, Math.floor(index / 9)); and use the above functions on flattened data like:

xyToSquare = (x, y) => .....
squareData = groupBy(flatten(sudokuData), partial(withIndexAsXY, xyToSquare));

which may seem more complicated - but it means things have become more reusable