<pre class="shiki github-dark shaku"><code>/** * @param {any} obj * @param {target} target * @return {boolean} */function myInstanceOf(obj, target) { if (!obj || typeof obj !== 'object') return false; if (Object.getPrototypeOf(obj) === target.prototype) { return true; } else { return myInstanceOf(Object.getPrototypeOf(obj), target); }}</code></pre>

My solution

Do you know how instanceOf works ? If so, please write you own myInstanceOf(). class A {}class B extends A {}const b = new B()myInstanceOf(b, B) // tr…