Checks if any value is of the type obtained from its object class equal to 'number', or an object type and an instance of Number and finite by using the Number.isFinite() method and is valid by using the Number.isNaN() method.

const isNumberObject = <Payload extends object>(
  value: any,
  callback: ResultCallback<any, Payload> = resultCallback,
  payload?: Payload
): value is Number =>
    (typeOf(value) === 'number' || typeof value === 'object') &&
      value instanceof Number &&
      !Number.isNaN(value.valueOf()) &&

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 isNumberObject() function from which it captures its value.


value: any

The value of any type to check.

callback: ResultCallback<any, Payload>

A 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 Number

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


The return value is a boolean indicating whether the value is an instance of Number.

Example usage

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

isNumberObject(10304050); // false
isNumberObject(Number(10304050)); // false
isNumberObject(new Number(10304050)); // true

Last updated