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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));          
    </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



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