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# JavaScript Number toExponential() Method

• Difficulty Level : Basic
• Last Updated : 07 Sep, 2020

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

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

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());          ```

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());          ```

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));          ```

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: