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<!DOCTYPE html> <html> <body> <h1>JavaScript Arrays</h1> <h2>The keys() Method</h2> <p>The keys() method returns an Iterator with the keys of an array:</p> <p id="demo"></p> <script> // Create an Array const fruits = ["Banana", "Orange", "Apple", "Mango"]; // Create an Iterable const list = fruits.keys(); // List the Keys let text = ""; for (let x of list) { text += x + "<br>"; } document.getElementById("demo").innerHTML = text; </script> <p>keys() is not supported in Internet Explorer.</p> </body> </html>
