Dart double toStringAsExponential()
Syntax & Examples

double.toStringAsExponential() method

Returns an exponential string-representation of the given numeric value with optional fraction digits.

Syntax of double.toStringAsExponential()

The syntax of double.toStringAsExponential() method is:

 String toStringAsExponential([int fractionDigits ])

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

Parameters

ParameterOptional/RequiredDescription
fractionDigitsoptionalthe number of digits after the decimal point

Return Type

double.toStringAsExponential() returns value of type String.


✐ Examples

1 Example with default fraction digits

In this example,

  1. We create a numeric value numValue with the value 12345.6789.
  2. We then use the toStringAsExponential() method without specifying the fraction digits, which defaults to the default number of digits.
  3. We print the exponential string representation to standard output.

Dart Program

void main() {
  num numValue = 12345.6789;
  String exponentialStr = numValue.toStringAsExponential();
  print(exponentialStr);
}

Output

1.23456789e+4

2 Example with 2 fraction digits

In this example,

  1. We create a numeric value numValue with the value 12345.6789.
  2. We then use the toStringAsExponential() method with 2 fraction digits specified.
  3. We print the exponential string representation to standard output.

Dart Program

void main() {
  num numValue = 12345.6789;
  String exponentialStr = numValue.toStringAsExponential(2);
  print(exponentialStr);
}

Output

1.23e+4

3 Example with 4 fraction digits

In this example,

  1. We create a numeric value numValue with the value 12345.6789.
  2. We then use the toStringAsExponential() method with 4 fraction digits specified.
  3. We print the exponential string representation to standard output.

Dart Program

void main() {
  num numValue = 12345.6789;
  String exponentialStr = numValue.toStringAsExponential(4);
  print(exponentialStr);
}

Output

1.2346e+4

Summary

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