title: [Vue warn]: Avoid mutating a prop directly since the value will be overwritten whenever the parent component re-renders
body: <p>I am learning vuejs but I can't find a proper answer.  When i am clicking on edit age button or change my name button i am getting below error.</p>
  
  <p>[Vue warn]: Avoid mutating a prop directly since the value will be overwritten whenever the parent component re-renders. Instead, use a data or computed property based on the prop's value. Prop being mutated: "myName"</p>
  
  <p>[Vue warn]: Avoid mutating a prop directly since the value will be overwritten whenever the parent component re-renders. Instead, use a data or computed property based on the prop's value. Prop being mutated: "userAge"</p>
  
  <p>Code is here.</p>
  
  <p><a href="https://codesandbox.io/s/k2197nr4o3" rel="nofollow noreferrer">https://codesandbox.io/s/k2197nr4o3</a></p>
  
  <p>Please let me know what is wrong in this code.</p>