title: How to return true if all values of array are true otherwise return false?
body: <p>I have a array like this:</p>
  
  <pre><code>var arr = [ true, true, true ];
  </code></pre>
  
  <p>Now I want to get <code>true</code>, because all keys of array above are <code>true</code>.</p>
  
  <p>another example:</p>
  
  <pre><code>var arr = [ true, false, true ];
  </code></pre>
  
  <p>Now I need to get <code>false</code>, because there is one <code>false</code> in the array.</p>
  
  <p>How can I do that?</p>