JavaScript | toExponential() Function

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

Parameters: This function 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.

Below examples illustrates the working of toExponential() function in JavaScript:

Passing a number as an argument in the toExponential() method. If a number is passed as argument to the toExponential() function then it represents the number of digits after decimal point.
<script type="text/javascript">

    var num = 2.13456;

    document.write(num.toExponential(2));

</script>
Output:
```
2.13e+0
```
Passing no parameter in the toExponential() method. Below program illustrates this:
<script type="text/javascript">

    var num = 2.13456;

    document.write(num.toExponential());

</script>
Output:
```
2.13456e+0
```
Passing a value which has more than 1 digit before the decimal point in the toExponential() method. Below program illustrates this:
<script type="text/javascript">

    var num=212.13456;

    document.write(num.toExponential());

</script>
Output:
```
2.1213456e+2
```
Passing zero as a parameter in the toExponential() method. Below program illustrates this:
<script type="text/javascript">

    var num = 212.13456;

    document.write(num.toExponential(0));

</script>
Output:
```
Output :2e+2
```

Exceptions:

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() function.
Type Error: This exception is thrown when the toFixed() method is invoked on an object that is not of type number.

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