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WebW3Schools is a web developer information website, with tutorials and references relating to web development topics such as HTML, CSS, JavaScript, PHP, SQL, and JQuery. Web5 apr. 2024 · The in operator returns true for properties in the prototype chain. This may be undesirable if you are using objects to store arbitrary key-value pairs. const ages = { alice: 18, bob: 27 }; function hasPerson(name) { return name in ages; } hasPerson("hasOwnProperty"); // true. You can use Object.hasOwn () to check if the … WebW3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, … greenwich baguio delivery menu