Minimum swaps for bracket balancing in node js

Js program for Minimum swaps for bracket balancing. Here problem description and other solutions.

/*
    Node JS program for
    Minimum swaps for bracket balancing
*/
class Test
{
	swapBalancingCount(text)
	{
		var n = text.length;
		if (n == 0)
		{
			return;
		}
		// Auxiliary variables
		var bracketCount = 0;
		var index = 0;
		var sum = 0;
		var data = (text).split('');
		// This is collecting the all open bracket character position.
		var openBracket = [];
		// This loop are collecting position of all open bracket.
		// And calculates the number of open and close brackets.
		for (var i = 0; i < n; ++i)
		{
			if (data[i] == '[')
			{
				openBracket.push(i);
				bracketCount++;
			}
			else
			{
				bracketCount--;
			}
		}
		if (bracketCount != 0)
		{
			// Means open and close brackets not same
			return;
		}
		// Reset bracket counter
		bracketCount = 0;
		for (var i = 0; i < n; ++i)
		{
			if (data[i] == '[')
			{
				bracketCount++;
				index++;
			}
			else if (data[i] == ']')
			{
				bracketCount--;
			}
			if (bracketCount < 0)
			{
				// Calculate number of swap operations
				// required to move to block brackets.
				// Here open break position will use
				sum += (openBracket[index] - i);
				// Swap element
				var t = data[i];
				data[i] = data[openBracket[index]];
				data[openBracket[index]] = t;
				// Reset counter
				bracketCount = 1;
				// Position to next open bracket
				index++;
			}
		}
		// Balancing bracket
		var ans = data.join("");
		// Display given and calculated results
		console.log(" Given text     : " + text);
		console.log(" Results text   : " + ans);
		console.log(" Swaps  : " + sum);
	}
}

function main()
{
	var task = new Test();
	var text = "]]][[[[]";
	/*
	    ]]][[[[]  <-  text
	      -- 
	    ]][][[[]  ➀ Swap position 2-3
	     --
	    ][]][[[]  ➁ Swap position 1-2
	    --
	    []]][[[]  ➂ Swap position 0-1
	       --
	    []][][[]  ➃ Swap position 3-4
	      --
	    [][]][[]  ➄ Swap position 2-3
	        --
	    [][][][]  ➅ Swap position 4-5
	    ----------------------------
	    Number of swap : 6
	*/
	task.swapBalancingCount(text);
	text = "][[][]";
	/*
	    ][[][]  <-  text
	    -- 
	    [][][]  ➀ Swap position 0-1

	    ----------------------------
	    Number of swap : 1
	*/
	task.swapBalancingCount(text);
}
main();

Output

 Given text     : ]]][[[[]
 Results text   : [][][][]
 Swaps  : 6
 Given text     : ][[][]
 Results text   : [][][]
 Swaps  : 1