<!DOCTYPE html>
<html>

  <script>
    'use strict';

    // define Matrix type objects
    function Matrix(values) // values is a 2D array
    {
        var m, rowCount, colCount;
        this.m = values;
        this.rowCount = values.length;
        this.colCount = values[0].length; // assume is rectangular not ragged
        // display function:
        this.show = function ()
        {
            for (var row = 0; row < this.rowCount; row++)
            {
                for (var col = 0; col < this.colCount; col++)
                {
                    document.write(this.m[row][col] + " ");
                }
                document.writeln("<br>");
            }
            document.writeln("<br>");
        };
        // transpose function
        this.transpose = function ()
        {
          // make array of arrays, transposed
            var temp = new Array(this.colCount);
            for (var col = 0; col < this.colCount; col++)
            {
                temp[col] = new Array(rowCount);
            }
        // put values into 2D array
        for (var row = 0; row < this.rowCount; row++)
        {
            for (var col = 0; col < this.colCount; col++)
            {
              temp[col][row]=this.m[row][col];
            }

        }
        // return new Matrix based on temp
        return new Matrix(temp);
      };

    }

    var m = [[1, 2], [3, 4], [5,6]];
    var matrix1 = new Matrix(m);
    var matrix2 = matrix1.transpose();
    matrix2.show();
    var matrix3=matrix2.transpose();
    matrix3.show();
  </script>
  <head>
    <title>Matrix</title>
  </head>
  <body>
  </body>
</html>