Checks if the specified value is null or undefined.

const isNil = val => val === undefined || val === null;

isNil(null); // true
isNil(undefined); // true
isNil(''); // false

Checks if the specified value is <code class="notranslate">null</code> or <code class="notranslate">undefined</code>.
<ul>
<li>Use the strict equality operator to check if the value of <code class="notranslate">val</code> is equal to <code class="notranslate">null</code> or <code class="notranslate">undefined</code>.</li>
</ul>

Value is nil

More like this

Value is null

Value is undefined

Check if value is of type