JavaScript Number toExponential() Method

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

• Example:
  
  

  
  
  

  <script type="text/javascript">     var num = 212.13456;     document.write(num.toExponential(4));           </script>

• Output:

  Output :2.1213e+2

The toExponential() method in JavaScript is used to convert a number to its exponential form. It returns a string representing the Number object in exponential notation.

Syntax:

number.toExponential(value)

The toExponential() method is used with a number as shown in the above syntax using the ‘.’ operator. This method will convert a number to its exponential form.

Parameters: This method accepts a single parameter value . It is an optional parameter and it represents the value specifying the number of digits after the decimal point.

Return Value: The toExponential() method in JavaScript returns a string representing the given number in exponential notation with one digit before the decimal point.

The below examples illustrates the working of the toExponential() method in JavaScript:

1. Passing a number as an argument in the toExponential() method. If a number is passed as an argument to the toExponential() method then it represents the number of digits after the decimal point.
   Code# 1:
   
   

   
   
   

   <script type="text/javascript">     var num = 2.13456;     document.write(num.toExponential(2));           </script>

   Output:

   2.13e+0

2. Passing no parameter in the toExponential() method. Below program illustrates this:
   Code# 2:
   
   

   
   
   

   <script type="text/javascript">     var num = 2.13456;     document.write(num.toExponential());           </script>

   Output:

   2.13456e+0

3. Passing a value which has more than 1 digit before the decimal point in the toExponential() method. Below program illustrates this:
   Code# 3:
   
   

   
   
   

   <script type="text/javascript">     var num=212.13456;     document.write(num.toExponential());           </script>

   Output:

   2.1213456e+2

4. Passing zero as a parameter in the toExponential() method. Below program illustrates this:
   Code# 4:
   
   

   
   
   

   <script type="text/javascript">     var num = 212.13456;     document.write(num.toExponential(0));           </script>

   Output:

   Output :2e+2

Exceptions:

1. Range Error: This exception is thrown when the value parameter passed is too small or too large. Values between 0 and 20, inclusive, will not cause a RangeError. If you want to pass larger or smaller values than specified by this range then you have to accordingly implement the toExponential() method.
2. Type Error: This exception is thrown when the toFixed() method is invoked on an object that is not of type number.

Supported Browsers:

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