Array.entries()
The Array.entries() in JavaScript is used to get a new Array that contains the key and value pairs for each index of an array. It returns an Array Iterator object with key/value pairs.
syntax
array.entries();
Example
In the following example elements.entries() method, using for loop, access every element and generate key/value pair of the particular element.To simplify the code we just assigned an iterator variable to elements.entries().
.
<html>
<body>
<script>
var elements = ["Helium", "Neon", "Krypton", "Xenon", "Radon"];
var iterator = elements.entries();
for (let e of iterator) {
document.write(e);
document.write("</br>");
}
</script>
</body>
</html>Output
0,Helium 1,Neon 2,Krypton 3,Xenon 4,Radon