Desafío de ejemplo

var Sudoku = function (data) {
  const lilSquaresQty = data.length;
  const sqrSize = Math.sqrt(data.length);
  const sumRequired = [...Array(data.length + 1).keys()].reduce(
    (acc, current, index) => acc + index + current
    );
  const isArrayX = (arr) =>
    arr.reduce((acc, current) => acc + current) === sumRequired;

  const colToArr = (n) => data.map((v) => v[n]);
  const sqrToArr = (r, c) =>
    [].concat.apply(
      [],
      data.filter((v, i) => i >= r && i < r + sqrSize)
    );

  const validateSqrs = () => {
    for (leti = 0; i < lilSquaresQty; i++) {
      const r = sqrSize * Math.floor(i / sqrSize),
        c = sqrSize * (i - r);
      const arr = sqrToArr(r, c);
      if (!isArrayX(arr)) {
        return false;
      }
    }
    return true;
  };

  const validateRows = () => {
    for (const row of data) {
      if (!isArrayX(row)) {
        return false;
      }
    }
    return true;
  };

  const validateCols = () => {
    for (let i = 0; i < data.length; i++) {
      if (!isArrayX(colToArr(i))) {
        return false;
      }
    }
    return true;
  };

  return {
    isValid: () => validateRows() && validateCols() && validateSqrs(),
  };
};