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JavaScript array.keys() method
The JavaScript array.keys() creates an array iterator object having only the keys of an array
Following is the code for the array.keys() method −
Example
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<style>
body {
font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}
.sample {
font-size: 20px;
font-weight: 500;
}
</style>
</head>
<body>
<h1>JavaScript array keys()</h1>
<div class="sample"></div>
<button class="Btn">CLICK HERE</button>
<h3>
Click on the above button to see the keys of the array
</h3>
<script>
let fillEle = document.querySelector(".sample");
let arr = ["H", "E", "L", "L", "O"];
fillEle.innerHTML = arr;
arr = arr.keys();
document.querySelector(".Btn").addEventListener("click", () => {
fillEle.innerHTML = "";
for (let x of arr) {
fillEle.innerHTML += x + "<br>";
}
});
</script>
</body>
</html>Output
On clicking the “CLICK HERE” button −
Updated on: 08-May-2020
92 Views
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