title: Child method to update parent state
body: <p>I know the standard is to the parent to pass down a method for which the child will call to update the state.</p>
  
  <p>However my parent is getting too many methods. </p>
  
  <p>Is there any way to have the children components updating the parent with their own methods, so the parent doesn't have like hundred functions?</p>
  
  <p>e.g.:</p>
  
  <pre><code>parentState: {
      stateBlue: { ... },
      stateRed: { ... },
      stateGreen: { ... }
  }
  
  ParentComponent
  
      ChildComponentBlue
          method1
          method2
          method3
  
      ChildComponenRed
          method1
          method2
          method3
  
      ChildComponenGreen
          method1
          method2
          method3
  </code></pre>