Dart double toStringAsFixed()
Syntax & Examples

double.toStringAsFixed() method

The `toStringAsFixed` method converts the given number to a string with a fixed number of decimal places.

Syntax of double.toStringAsFixed()

The syntax of double.toStringAsFixed() method is:

 String toStringAsFixed(int fractionDigits)

This toStringAsFixed() method of double returns a decimal-point string-representation of this.

Parameters

ParameterOptional/RequiredDescription
fractionDigitsrequiredthe number of digits after the decimal point

Return Type

double.toStringAsFixed() returns value of type String.


✐ Examples

1 Convert a double to a string with two decimal places

In this example,

  1. We define a double num with a value of 3.14159.
  2. We call the toStringAsFixed method on num with 2 as the number of digits after the decimal point.
  3. We print the result to standard output.

Dart Program

void main() {
  double num = 3.14159;
  String result = num.toStringAsFixed(2);
  print('Result: $result');
}

Output

Result: 3.14

2 Convert a double to a string with three decimal places

In this example,

  1. We define a double num with a value of 123.456789.
  2. We call the toStringAsFixed method on num with 3 as the number of digits after the decimal point.
  3. We print the result to standard output.

Dart Program

void main() {
  double num = 123.456789;
  String result = num.toStringAsFixed(3);
  print('Result: $result');
}

Output

Result: 123.457

3 Convert a num to a string with four decimal places

In this example,

  1. We define a num num with a value of 987.654321.
  2. We call the toStringAsFixed method on num with 4 as the number of digits after the decimal point.
  3. We print the result to standard output.

Dart Program

void main() {
  double num = 987.654321;
  String result = num.toStringAsFixed(4);
  print('Result: $result');
}

Output

Result: 987.6543

Summary

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