Instanceof Operator Javascript Programming EAQ5JBsX YI

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. Checks the current object and returns true if the object is of the specified object type. Here are some good examples and here is an example taken directly from Mozilla's developer site: One thing worth mentioning is instanceof evaluates to true if the object inherits from the class's prototype:

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