Javascript Number() Function

Below is the example of the Number() function.

• Example:

  <script>
      // JavaScript to illustrate
      // Number() function
      function func() {
  
          // Original string
          var a = true;
  
          var value = Number(a);
          document.write(value);
      }
  // Driver code
  func();
  </script>
• Output:

  1

The Number() function is used to convert data type to number.

Syntax:

Number(object)

Parameters: This function accept a single parameter as mentioned above and described below:

object: This parameter holds the objects that will be converted any type of javascript variable to number type.

Return Values: Number() function returns the number format for any type of javascript variable.

Below examples illustrate the Number() function in JavaScript:

• Example 1:

  Input : Number(true);
               Number(false);
  Output : 1
           0

• Example 2: Not a number is returned by the compiler.

  Input : Number("10 20");
  Output: NaN

• Example 3: The Number() method above returns the number of milliseconds since 1.1.1970.

  Input : Number(new Date("2017-09-30"));
  Output : 1506729600000

• Example 4:

  Input : Number("John");
  Output : NaN
  

More example codes for the above function are as follows:

Program 1:

<script>
    // JavaScript to illustrate Number() function
    function func() {

        // Original string
        var a = "10 20";

        var value = Number(a);
        document.write(value);
    }
// Driver code
func();
</script>

Output:

NaN

Program 2:

<script>
    // JavaScript to illustrate Number() function
    function func() {
        var value = Number(new Date("2017-09-30"));
        document.write(value);
    }
// Driver code
func();
</script>

Output:

1506729600000

Program 4:

<script>
    // JavaScript to illustrate Number() function
    function func() {
        var value = Number("John");
        document.write(value);
    }
// Driver code
func();
</script>

Output:

NaN

Supported Browsers:

• Google Chrome
• Firefox
• Internet Explorer
• Safari
• Opera