Spiral Matrix II

Problem statement

Given a positive integer n, generate an n x n matrix filled with elements from 1 to n2 in spiral order.

Example 1:

Input: n = 3Output: [[1,2,3],[8,9,4],[7,6,5]]

Example 2:

Input: n = 1Output: [[1]]

Constraints:

• 1 <= n <= 20

My solution

/**
 * @param {number} n
 * @return {number[][]}
 */
var generateMatrix = function(n) {
    let row = 0;
    let col = 0;
    let count = 1;
    let rowRange = [0, n - 1];
    let colRange = [0, n - 1];
    
    let matrix = Array.from({
        length: n
    }, () => Array.from({
        length: n
    }, () => 0))
    
    const toRight = () => {
        while (col <= colRange[1]) {
            matrix[row][col] = count++;
            col++
        }
        col--;
        colRange[1]--
        row++;
    }
    
    const toBottom = () => {
        while (row <= rowRange[1]) {
            matrix[row][col] = count++;
            row++
        }
        row--;
        rowRange[0]++;
        col--;
    }
    
    const toLeft = () => {
        while(col >= colRange[0]) {
            matrix[row][col] = count++;
            col--
        };
        col++;
        colRange[0]++;
        row--;
    }
    
    const toTop = () => {
        while(row >= rowRange[0]) {
            matrix[row][col] = count++;
            row--
        }
        row++
        rowRange[1]--
        col++
    }
    
    
    while (rowRange[0] <= rowRange[1] && colRange[0] <= colRange[1]) {
        toRight();
        toBottom();
        toLeft();
        toTop();
    }
    
    return matrix;
};