title: Make a synchronized new for Modules in Node.js
body: <p>When I use node.js and I write this code:</p>
  
  <pre><code>const Matrix  = require('./src/matrix/matrix');
  var matrix1 = new Matrix("input1.dat","input2.dat");
  var matrix2 = new Matrix("input1.dat","input2.dat");
  </code></pre>
  
  <p>They make new for both matrix variables at the same Time, but I need to make new for matrix2 after matrix1 is finished</p>