isUndefined
The isUndefined function checks if the provided value is undefined.
Syntax
typescript
isUndefined(value: any): value is undefined;Parameters
| Parameter | Type | Description |
|---|---|---|
value | any | Value to be checked |
Returns
| Type | Description |
|---|---|
boolean | True if it is undefined |
Examples
typescript
isUndefined(undefined); // => true
isUndefined(null); // => false
isUndefined(0); // => falseNotes
- Useful for validating uninitialized variables.