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ES6 - Number.isNaN
This function returns true if the given value is Not-a-Number (NaN) and its type is Number; otherwise, it returns false.
Syntax
Below mentioned is the syntax for the function Number.isNaN, where value is the number to determine if it is a NaN.
var res = Number.isNaN(value);
Example
<script>
console.log(Number.isNaN('123'))//false
console.log(Number.isNaN(NaN))//true
console.log(Number.isNaN(0/0))//true
</script>
The output of the above code will be as shown below −
false true true
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