Guards the value to be a date.

const guardDate = <Payload extends object>(
  value: Date,
  callback?: ResultCallback<Date, Payload>,
  payload?: Payload
): value is Date => isDate(value, callback, payload);

Generic type variables


The Payload generic type variable constrained by object indicates the type of optional parameter payload of the supplied callback function and payload optional parameter of the guardDate() function from which it captures its value.


value: Date

The value of Date type to guard.

callback?: ResultCallback<Class, Payload>

The optional callback function of ResultCallback type with parameters, the value that has been checked, the result of this check, and payload of generic type variable Payload with optional properties from the provided payload, to handle them before the result return. By default, it uses resultCallback() function.

payload?: Payload

An optional object of the generic type variable Payload is assigned to the payload of the given callback function.

Return type

value is Date

The return type is a boolean as the result of its statement value is Date.


The return value is a boolean indicating whether the value is a Date.

Example usage

// Example usage.
import { guardDate } from '@angular-package/type';

guardDate(new Date('December 17, 1995 03:24:00')); // true, value is Date
guardDate(new Date('1995-12-17T03:24:00')); // true, value is Date
guardDate(new Date(1995, 11, 17)); // true, value is Date
guardDate(new Date(1995, 11, 17, 3, 24, 0)); // true, value is Date
guardDate(new Date(628021800000)); // true, value is Date

Last updated