Dart num toStringAsExponential()
Syntax & Examples

num.toStringAsExponential() method

The `toStringAsExponential` method in Dart returns an exponential string representation of this number.

Syntax of num.toStringAsExponential()

The syntax of num.toStringAsExponential() method is:

 String toStringAsExponential([int fractionDigits ])

This toStringAsExponential() method of num returns an exponential string-representation of this.

Parameters

ParameterOptional/RequiredDescription
fractionDigitsoptionalThe number of digits after the decimal point. If not provided, it defaults to null.

Return Type

num.toStringAsExponential() returns value of type String.


✐ Examples

1 Exponential representation without specifying fraction digits

In this example,

  1. We create a num variable num1 with the value 123456.789.
  2. We use the toStringAsExponential() method to get its exponential string representation.
  3. We then print the result to standard output.

Dart Program

void main() {
  num num1 = 123456.789;
  String exponentialString = num1.toStringAsExponential();
  print('Exponential representation of $num1: $exponentialString');
}

Output

Exponential representation of 123456.789: 1.23456789e+5

2 Exponential representation with 2 fraction digits

In this example,

  1. We create a num variable num1 with the value 123456.789.
  2. We use the toStringAsExponential() method with 2 fraction digits to get its exponential string representation.
  3. We then print the result to standard output.

Dart Program

void main() {
  num num1 = 123456.789;
  String exponentialString = num1.toStringAsExponential(2);
  print('Exponential representation of $num1 with 2 fraction digits: $exponentialString');
}

Output

Exponential representation of 123456.789 with 2 fraction digits: 1.23e+5

Summary

In this Dart tutorial, we learned about toStringAsExponential() method of num: the syntax and few working examples with output and detailed explanation for each example.