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check if object instance of class core interview pattern Pattern

Pattern hubs are for building transferable solving frames. Learn the recognition signals first, then drill state definition, update rules, and edge explanation until the pattern feels stable.

database1 problemstune0/1/0 difficulty mixcategory0 linked topics

Pattern brief

Recognize first

Candidate's ability to handle inheritance and prototype chains in JavaScript.

Solve rhythm

State the active state and invariant first, explain how each update preserves them, then pressure-test with counterexamples.

Most common miss

Forgetting that `instanceof` will check both the class and its parent classes, which can lead to incorrect results if not handled properly.

Recognition signals

  • Candidate's ability to handle inheritance and prototype chains in JavaScript.
  • Understanding of how `instanceof` works in JavaScript and potential pitfalls.

Solve flow

  1. 1. Define the active state/window.
  2. 2. Update state while preserving invariants.
  3. 3. Validate with edge-heavy examples.

Common misses

  • Forgetting that `instanceof` will check both the class and its parent classes, which can lead to incorrect results if not handled properly.

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      Check if Object Instance of Class

      Implement a function to check if an object is an instance of a specific class or its superclass in JavaScript.

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      Check if Object Instance of Class core interview pattern LeetCode Pattern: 1 Solutions