Spiral Matrix

spiral-matrix.js

function spiralMatrix([arr]) {
    printMatrix(getMatrix(arr));

    function getMatrix(arr) {
        let [rows, cols] = arr.split(' ')
                            .filter(x => x != '')
                            .map(Number);
        let [count, maxCount, minRow, minCol, maxRow, maxCol] = [0, rows * cols, 0, 0, rows-1, cols-1];
        let matrix = [];
        for (let r = 0; r < rows; r++) matrix[r] = [];
        while (count < maxCount) {
            for (let c = minCol; c <= maxCol && count < maxCount; c++)	matrix[minRow][c] = ++count;
            minRow++;
            for (let r = minRow; r <= maxRow && count < maxCount; r++)	matrix[r][maxCol] = ++count;
            maxCol--;
            for (let c = maxCol; c >= minCol && count < maxCount; c--)	matrix[maxRow][c] = ++count;
            maxRow--;
            for (let r = maxRow; r >= minRow && count < maxCount; r--)	matrix[r][minCol] = ++count;
            minCol++;
        }
        return matrix;
    }

    function printMatrix(matrix) {
        matrix.forEach(row => console.log(row.join(' ')));
        // console.log(matrix.map(row => row.join(' ')).join('\n'));
    }
}

spiralMatrix(['5 5']);

spiralMatrix(['3 3']);