title: How to create arrays and assign value to any index in typescript
body: <p>How can i achieve following javascript code in typescript.</p>
  
  <pre><code>var childs = [];
  childs[34] = [12,23,54,65];
  childs[122] = [43,56,23,31];
  childs[212343] = [345,643,24,745];
  console.log(childs);
  </code></pre>