Web Reference: Jul 8, 2025 · The instanceof operator tests to see if the prototype property of a constructor appears anywhere in the prototype chain of an object. The return value is a boolean value. Its behavior can be customized with Symbol.hasInstance. The instanceof operator returns true if an object is an instance of a specified object: instanceof is an ECMAScript3 (JavaScript 1999) feature. It is supported in all browsers: The spread (...) Operator. The instanceof keyword in JavaScript can be quite confusing when it is first encountered, as people tend to think that JavaScript is not an object-oriented programming language.
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