Checks if any value is a number type and finite by using the Number.isFinite() method and valid by the Number.isNaN() method.

const isNumberType = <Payload extends object>(
  value: any,
  callback: ResultCallback<any, Payload> = resultCallback,
  payload?: Payload
): value is number =>
    typeof value === 'number' && Number.isFinite(value) && !Number.isNaN(value),

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 isNumberType() 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 provided value is a number.


The return value is a boolean indicating whether the provided value is a number type.

Example usage

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

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

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