is-class-of v1.0.1

is-class-of

Returns true if A is a subclass of B or the same class as B.

Installation

Requires Node.js 6.0.0 or above.

npm i is-class-of

API

The module exports a single function.

Parameters

1. Bindable: A (function): What may or may not be B or a subclass of B.
2. B (function or string): What may or may not be A or an ancestor of A. You can either provide the class itself or its string name.

Return Value

• Returns true if A is a subclass of B, is equal to B, or has a name equal to B.
• Otherwise false.

Example

const isClassOf = require('is-class-of')

isClassOf(Date, Error) // false

isClassOf(Error, Error) // true
isClassOf(Error, 'Error') // true
isClassOf(TypeError, Error) // true
isClassOf(RangeError, Error) // true
isClassOf(RangeError, 'Error') // true

class A {}
class B extends A {}
isClassOf(A, A) // true
isClassOf(A, 'A') // true
isClassOf(B, A) // true
isClassOf(B, 'A') // true

// Supports the bind operator
Error::isClassOf(Error) // true
TypeError::isClassOf(Error) // true
TypeError::isClassOf('Error') // true
B::isClassOf(A) // true

Related

• is-subclass-of: Returns true if A is a subclass of B.
• is-instance-of: Like instanceof, but uses class name strings.