Magic Matrices

function solve(array) {
  let sumOfRows = 0;
  array.forEach((row, index) => {
    let isEqual = true;
    if (array[index + 1]) {
      if (
        row.reduce((acc, el) => acc + el) ==
        array[index + 1].reduce((acc, el) => acc + el)
      ) {
        sumOfRows = row.reduce((acc, el) => acc + el);
      } else {
        isEqual = false;
      }
    }
  });
  let counter = 0;
  let sumOfColumns = 0;
  let currSum = 0;
  let fistCHeck = false;
  for (let i = 0; i < array.length; i++) {
    for (let j = 0; j < array.length; j++) {
      sumOfColumns += array[j][counter];
    }
    if (currSum !== sumOfColumns && !fistCHeck) {
      currSum = sumOfColumns;
      fistCHeck = true;
    } else {
      fistCHeck = false;
      break;
    }
    sumOfColumns = 0;
    counter++;
  }

  if (sumOfColumns === sumOfRows) {
    console.log(true);
  } else {
    console.log(false);
  }
}
solve([
  [4, 5, 6],
  [6, 5, 4],
  [5, 5, 5],
]);