07. Spiral Matrix (Arrays More Exercise)

function solve(arg1,arg2){
    let end = arg1*arg2;

    let matrix = [];
    for(let i = 0; i < arg1; i++) {
        matrix[i] = [];
        for(let j = 0; j < arg2; j++){
            matrix[i][j] = 0;
        }
    }


    let stepRow = [0,1,0,-1];
    let stepCol = [1,0,-1,0];
    let indexChange = 0;
    let index = indexChange%4;
    let row = 0;
    let col = 0;



    function isInvalid(){
        if(row < 0 || row > arg1 - 1 || col < 0 || col > arg2 - 1){
            return true;
        }
        if(row >=0 && row <= arg1 - 1 && col >= 0 && col <= arg2 - 1){
            if(matrix[row][col] !== 0){
                return true;
            }
        }
    }

for(let i = 1; i <= end; i++){
    matrix[row][col] = i;
    if(i === end){break;}
    row += stepRow[index];
    col += stepCol[index];
    if(isInvalid()){
        row -= stepRow[index];
        col -= stepCol[index];
        indexChange++;
        index = indexChange%4;
        row += stepRow[index];
        col += stepCol[index];
    }
}

    console.log(matrix.map(r => r.join(' ')).join('\n'));
}