diagonal matrix

function DiagonalAttack(input){
    let matrix=input.map(row => row.split(" ").map(Number));
    let leftDiagonal=0;
    let rightDiagonal=0;
    let count=0;
    let result;
    for (const row of matrix) {
        leftDiagonal+=row[count];
        rightDiagonal+=row[row.length-1-count];
        count++;
    }
    if(leftDiagonal===rightDiagonal){
        let changeCount=0;
        for (const row of matrix) {
            for (let index = 0; index < row.length; index++) {
                if(changeCount!=index && row.length-1-changeCount!=index){
                        row[index]=leftDiagonal;
                    }
            }
            changeCount++;
        }

    }

       result=matrix.map(row => row.join(" ")).join("\n");

       console.log(result);
}