Function: filterNullAndUndefined()
filterNullAndUndefined<
TValue>(value:Nullish|TValue):value is TValue
Checks whether a value is not null nor undefined.
This can be used in Array.filter to remove null and undefined from the array type
Type Parameters
| Type Parameter |
|---|
TValue |
Parameters
| Parameter | Type | Description |
|---|---|---|
value | Nullish | TValue | The value to verify that is neither null nor undefined |
Returns
value is TValue
A boolean that is true if the value is neither null nor undefined, false otherwise.
Example
// TypeScript Type: (string | undefined | null)[]
const someArray = ['one', 'two', undefined, null, 'five'];
// TypeScript Type: string[]
const filteredArray = someArray.filter(filterNullAndUndefined);
// Result: ['one', 'two', 'five']