<pre class="language-javascript"><code class="language-javascript">/**
 * @param {any[]} args
 * @returns {string}
 */
function classNames(...args) {
 return args
 .flat(Infinity)
 .filter(val =&gt; val &amp;&amp; ['object', 'number', 'string'].includes(typeof val))
 .flatMap(val =&gt;
 typeof val == 'object'
 ? Object.keys(val).filter(p =&gt; !!val[p])
 : val
 )
 .join` `
}</code></pre>

ᕕ( ᐛ )ᕗ

If using React, you can set the prop className to add class name to an element, it is string so you can add multiple class names like this: BFE.dev ca…