README.md

determine if a constructor object recognizes an object as its instance

install

``bash
yarn add has-instance
yarn-tool add has-instance
yt add has-instance
`

demo

`
import { hasInstance, isInstanceOf } from 'has-instance';

test(hasInstance, () =>
{
let fn = hasInstance(String);

expect(fn(new String())).toStrictEqual(true);
expect(fn('')).toStrictEqual(false);

});

test(isInstanceOf, () =>
{
let fn = isInstanceOf(new String(), String);

expect(isInstanceOf(new String(), String)).toStrictEqual(true);
expect(isInstanceOf('', String)).toStrictEqual(false);

});
``