Below is the example of the Number.isNaN() Method.

• Example:
  filter_none

  edit
  close

  play_arrow

  link
  brightness_4
  code

  <script> function GFGFun() {   var res = "";   res = res + Number.isNaN(123); document.write(res);      } GFGFun(); </script>

  chevron_right

  filter_none

• Output:

  false

The Number.isNan method in JavaScript is used to determines whether the passed value is NaN(Not a Number) and is of the type “Number”.
In JavaScript, the value NaN is considered a type of number.

Syntax:

Number.isNaN(value)

Parameters Used:
1. Value :It is the value which is to be tested for NaN.

Return Value:
The Number.isNaN() method in JavaScript returns true if the passed value is Nan and is of the type number,else it returns false.

Examples:

Input : 0/0
Output : true
     
Input : 213
Output : false

Input : '213'
Output : false

Input : 'hello'
Output : false

Input : NaN
Output : true

1. When an equation resulting in infinite value is passed as a parameter.
   filter_none

   edit
   close

   play_arrow

   link
   brightness_4
   code

   <script> function GFGFun() {   var res = "";   res = res + Number.isNaN(0/0); document.write(res);      } GFGFun(); </script>

   chevron_right

   filter_none

   Output:

   Output : true

2. When a number is passed as a parameter.
   filter_none

   edit
   close

   play_arrow

   link
   brightness_4
   code

   <script> function GFGFun() {   var res = "";   res = res + Number.isNaN(321); document.write(res);      } GFGFun(); </script>

   chevron_right

   filter_none

   Output:

   Output : false

3. When a number in string representation is passed as a parameter.
   filter_none

   edit
   close

   play_arrow

   link
   brightness_4
   code

   <script> function GFGFun() {   var res = "";   res = res + Number.isNaN(213); document.write(res);      } GFGFun(); </script>

   chevron_right

   filter_none

   Output:

   Output : false

4. When a string is passed as a parameter.
   filter_none

   edit
   close

   play_arrow

   link
   brightness_4
   code

   <script> function GFGFun() {   var res = "";   res = res + Number.isNaN("hello"); document.write(res);      } GFGFun(); </script>

   chevron_right

   filter_none

   Output:

   Output : false

5. When Nan is passed as a parameter.
   filter_none

   edit
   close

   play_arrow

   link
   brightness_4
   code

   <script> function GFGFun() {   var res = "";   res = res + Number.isNaN(NaN); document.write(res);      } GFGFun(); </script>

   chevron_right

   filter_none

   Output:

   Output : true

Supported Browsers:

• Google Chrome
• Internet Explorer 12
• Firefox 32
• Apple Safari 9
• Opera 22