title: Smart way to check if every entry in a object is not null or undefined
body: <p>I have got an object, that may look like this:</p>
  <pre><code>{
    address: {
      street: undefined,
      country: 'GB'
    },
    givenname: 'Marko',
    surname: null,
  }
  </code></pre>
  <p>I want to know if all fields are set or if at least one is null. Is there a smarter / shorter way to dot his in javascript than</p>
  <pre><code>address.street != null &amp;&amp; address.country != null &amp;&amp; givenname != null &amp;&amp; surname != null
  </code></pre>
  <p>Maybe something that looks like this:</p>
  <pre><code>// this could return true or false?
  nullCheck(address.street, address.country, givenname, surname)
  </code></pre>