Spiral traversal of matrix in typescript

Ts program for Spiral traversal of matrix. Here problem description and other solutions.

// TypeScript program for 
// Spiral form of matrix
class SpiralView
{
	public spiral(data: number[][], 
  startRow: number, startCol: number, 
  endRow: number, endCol: number, element: number)
	{
		// Left to right
		for (var i = startCol; i <= endCol && element > 0; ++i)
		{
			element--;
			console.log("  " + data[startRow][i]);
		}
		// Top to down
		for (var i = startRow + 1; i <= endRow && element > 0; ++i)
		{
			element--;
			console.log("  " + data[i][endCol]);
		}
		// Bottom right to bottom-left
		for (var i = endCol - 1; i >= startCol && element > 0; --i)
		{
			element--;
			console.log("  " + data[endRow][i]);
		}
		// Bottom left to top
		for (var i = endRow - 1; i > startRow && element > 0; --i)
		{
			element--;
			console.log("  " + data[i][startRow]);
		}
		if (startRow + 1 <= endRow - 1 && element > 0)
		{
			// Recursive call
			this.spiral(data, startRow + 1, 
                        startCol + 1, endRow - 1, 
                        endCol - 1, element);
		}
	}
	public static main(args: string[])
	{
		var task = new SpiralView();
		// Given matrix
		var matrix: number[][] = [
			[1, 2, 3, 4, 5, 6],
			[22, 23, 24, 25, 26, 7],
			[21, 36, 37, 38, 27, 8],
			[20, 35, 42, 39, 28, 9],
			[19, 34, 41, 40, 29, 10],
			[18, 33, 32, 31, 30, 11],
			[17, 16, 15, 14, 13, 12]
		];
		var row = matrix.length;
		var col = matrix[0].length;
		// Get the number of element
		var element = row * col;
		task.spiral(matrix, 0, 0, row - 1, col - 1, element);
	}
}
SpiralView.main([]);
/*
 file : code.ts
 tsc --target es6 code.ts
 node code.js
 */

Output

  1
  2
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  4
  5
  6
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  11
  12
  13
  14
  15
  16
  17
  18
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  22
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  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42


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