The post says:<p><pre><code>  In javascript, everything is mutable, but w&#x2F; new es7
  spread&#x2F;rest syntax it is increasingly easy to just do
  immutable anyway. E.g. instead of myobj.x = newx you can
  do myobj = {...myobj, x: newx} and everything is immutable
  &amp; persistant!
</code></pre>
But if I&#x27;m reading this right:<p><a href="https:&#x2F;&#x2F;github.com&#x2F;sebmarkbage&#x2F;ecmascript-rest-spread" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;sebmarkbage&#x2F;ecmascript-rest-spread</a><p>They will be neither immutable nor persistent.