Magic Matrices

function magicMatrices(arr) {
    let result = true;
    let rowCheck = arr[0].reduce((a, b) => a + b, 0);

    for (let i = 0; i < arr.length; i++) {
        let checkSum = arr[i].reduce((a, b) => a + b, 0);
        if (checkSum !== rowCheck) {
            result= false;
            break;
        }
        let checkRow = 0;
        for (let j = 0; j < arr.length; j++) {
            checkRow += arr[i][j];
        }
        if (checkRow !== rowCheck) {
            result = false;
            break;
        }
        checkRow = 0;
    }
    console.log(result ? 'true' : 'false')
}

magicMatrices([[4, 5, 6],
    [6, 5, 4],
    [5, 5, 5]]);