Function isSubclassOf

Source: IsSubclassOf.ts

Checks whether a class constructor is a subclass of another class constructor by traversing the prototype chain.

Import

import { isSubclassOf } from '@litert/utils-object';

Signature

function isSubclassOf(subClass: IConstructor, parentClass: IConstructor): boolean;

Parameters

• Parameter subClass: IConstructor

  The constructor to test. The function checks whether this is a subclass of parentClass.

• Parameter parentClass: IConstructor

  The constructor to test against.

Return Value

true if subClass is a direct or indirect subclass of parentClass. Returns false if they are the same class (a class is not considered a subclass of itself).

Examples

import { isSubclassOf } from '@litert/utils-object';

class Animal {}
class Mammal extends Animal {}
class Dog extends Mammal {}

console.log(isSubclassOf(Dog, Mammal));  // true
console.log(isSubclassOf(Dog, Animal));  // true
console.log(isSubclassOf(Dog, Dog));     // false (same class)
console.log(isSubclassOf(Animal, Dog));  // false (parent ≠ subclass)