Magic Square Check - PhillyDev Slack #daily_programmer - 20170301

dp20170301.js

function magicSquareCheck(square) {
  checkIndices = [
    [0, 1, 2],
    [3, 4, 5],
    [6, 7, 8],
    [0, 3, 6],
    [1, 4, 7],
    [2, 5, 8],
    [0, 4, 8],
    [2, 4, 6]
  ];

  return checkIndices.map(squareCheck).reduce(allPass, true);

  function squareCheck(i) {
    let currentCheck = new Array(square[i[0]], square[i[1]], square[i[2]]);
    currentCheck = currentCheck.reduce(sumArray, 0);
    return (currentCheck == 15) ? true : false;
  }

  function sumArray(a, b) {
    return a + b;
  }

  function allPass(a, b) {
    return a && b;
  }
}

console.log(magicSquareCheck([8, 1, 6, 3, 5, 7, 4, 9, 2]));
console.log(magicSquareCheck([2, 7, 6, 9, 5, 1, 4, 3, 8]));
console.log(magicSquareCheck([3, 5, 7, 8, 1, 6, 4, 9, 2]));
console.log(magicSquareCheck([8, 1, 6, 7, 5, 3, 4, 9, 2]));