Dart int.parse()
Syntax & Examples

int.parse() static-method

The `parse` method in Dart parses a string as a, possibly signed, integer literal and returns its value.

Syntax of int.parse()

The syntax of int.parse() static-method is:

 int parse(String source, { int radix, int onError(String source) })

This parse() static-method of int parse source as a, possibly signed, integer literal and return its value.

Parameters

ParameterOptional/RequiredDescription
sourcerequiredThe string to parse as an integer.
radixoptionalThe radix of the parsed integer. If not provided, it defaults to 10.
onErroroptionalA function that handles errors encountered during parsing. If not provided, an exception is thrown.

Return Type

int.parse() returns value of type int.


✐ Examples

1 Parsing a positive integer

In this example,

  1. We define a string source containing the integer 123.
  2. We use the parse method to parse the string as an integer.
  3. We print the parsed integer value to standard output.

Dart Program

void main() {
  String source = '123';
  int value = int.parse(source);
  print('Parsed integer value: $value');
}

Output

Parsed integer value: 123

2 Parsing a negative integer

In this example,

  1. We define a string source containing the integer -456.
  2. We use the parse method to parse the string as an integer.
  3. We print the parsed integer value to standard output.

Dart Program

void main() {
  String source = '-456';
  int value = int.parse(source);
  print('Parsed integer value: $value');
}

Output

Parsed integer value: -456

3 Parsing a hexadecimal integer

In this example,

  1. We define a string source containing the hexadecimal integer FF.
  2. We use the parse method with a radix of 16 to parse the string as an integer.
  3. We print the parsed integer value to standard output.

Dart Program

void main() {
  String source = 'FF';
  int value = int.parse(source, radix: 16);
  print('Parsed integer value: $value');
}

Output

Parsed integer value: 255

Summary

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