keys() - FUNCTION

keys() Function is used to return the keys from an Array .

Let us say, we have a Array that contains five names, Mohan, Kriti, Philip, Salim and Andrew. And we want to get the index for the values.

Example :

<html>
<body>  
<script>

	var x = ["Mohan", "Kriti", "Philip", "Salim", "Andrew"]
	var y = x.keys()
	
	for(i of y) {
		document.write(i, "</br>")
	}    
    
</script>      
</body>
</html>

Output :

0
1
2
3
4

So, we have an Array that has 5 names.

In the above Array, the indexes are the Keys and its actual values are the values. And keys() function extracts keys or indexes.

var y = x.keys()

Now, if you see the output, you get the keys.

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