isNone

const isNone: <T>(option) => option is None

Checks whether the given Option contains no value.

This function acts as a type guard, ensuring the value is a None.

Type Parameters

Parameters

Returns

option is None

true if the option is a None, false otherwise.

Example

Checking for None values.

isNone(some(42)); // false
isNone(none());   // true

See

• Option
• None