collectype / factory/dates/dateState / dateStateFactory
dateStateFactory<
T,C>(ctx,oper): <K>(field) =>C
Defined in: factory/dates/dateState.ts:40
Creates a predicate filter for date state using PredicType.date.state.
T
The item type in the collection.
C extends Wherable<T, C>
The Wherable context type (must extend Wherable<T, C>).
C
The context (usually a collection) supporting the where method.
DateStateOper
The date state operation (e.g., ‘isValid’, ‘isInvalid’, etc.).
Returns a function that takes a field (of type Date on T) and applies the date state predicate to filter the context.
<
K>(field):C
K extends string | number | symbol
K
C
// Example: Composing a date state filter as a property, homogeneous model
import { BaseFunctions } from 'collectype';
import { dateStateFactory } from 'collectype';
type Person = { name: string; birthday: Date };
class PersonFunctions extends BaseFunctions<Person> {
dateIsValid = dateStateFactory<Person, this>(this, 'isValid');
}
// Usage:
const people: Person[] = [
{ name: 'Alice', birthday: new Date('2000-01-01') },
{ name: 'Bob', birthday: new Date('invalid-date') }
];
const fn = new PersonFunctions(people);
const filtered = fn.dateIsValid('birthday');
// filtered contains the items where 'birthday' is a valid date