Core Code
Core Code Modern Dev Handbook

Undefined Data Type

A variable without a value is undefined.

Preview

Code

<script>
let value;

console.log(value);
console.log(typeof value);
</script>

More JS Data Types Examples (7)

example String Data Type open example example Number Data Type open example example Boolean Data Type open example example Null Value Example open example example Object Data Type open example example Array Data Type open example example Symbol Data Type open example