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<html><body><h1>JavaScript Objects</h1><h2>The Object.keys() Method</h2><p>Object.keys() returns an enumerable array of the keys of an object:</p><p id="demo"></p><script>const fruits = ["Banana", "Orange", "Apple", "Mango"];const keys = Object.keys(fruits);document.getElementById("demo").innerHTML = keys;</script><p>Object.keys() is not supported in Internet Explorer.</p></body></html>