Dart BigInt.tryParse()
Syntax & Examples

BigInt.tryParse() static-method

The BigInt static parse() method parses the given string source as a, possibly signed, integer literal and returns its value.

Syntax of BigInt.tryParse()

The syntax of BigInt.tryParse() static-method is:

 BigInt tryParse(String source, { int radix })

This tryParse() static-method of BigInt parses source as a, possibly signed, integer literal and returns its value.

Parameters

ParameterOptional/RequiredDescription
sourcerequiredthe string to attempt parsing as an integer
radixoptionalthe base of the numeral system used in source (defaults to 10 if not provided)

Return Type

BigInt.tryParse() returns value of type BigInt.


✐ Examples

1 Parsing a number

In this example,

  1. We create a string numberStr with the value '12345'.
  2. We use the tryParse() method to attempt parsing the string as an integer and store the result in a nullable BigInt variable number.
  3. We check if the parsing was successful by ensuring number is not null, then print the parsed number to standard output. If parsing fails, we print 'Invalid input'.

Dart Program

void main() {
  String numberStr = '12345';
  BigInt? number = BigInt.tryParse(numberStr);
  if (number != null) {
    print('Parsed number: $number');
  } else {
    print('Invalid input');
  }
}

Output

Parsed number: 12345

2 Parsing a character code

In this example,

  1. We create a string charStr with the value 'A'.
  2. We use the tryParse() method with a radix of 16 (hexadecimal) to attempt parsing the string as a hexadecimal integer and store the result in a nullable BigInt variable charCode.
  3. We check if the parsing was successful by ensuring charCode is not null, then print the parsed character code to standard output. If parsing fails, we print 'Invalid input'.

Dart Program

void main() {
  String charStr = 'A';
  BigInt? charCode = BigInt.tryParse(charStr, radix: 16);
  if (charCode != null) {
    print('Parsed character code: $charCode');
  } else {
    print('Invalid input');
  }
}

Output

Parsed character code: 10

3 Parsing a binary number

In this example,

  1. We create a string binaryStr with the value '1010'.
  2. We use the tryParse() method with a radix of 2 (binary) to attempt parsing the string as a binary integer and store the result in a nullable BigInt variable decimalValue.
  3. We check if the parsing was successful by ensuring decimalValue is not null, then print the parsed binary number to decimal form to standard output. If parsing fails, we print 'Invalid input'.

Dart Program

void main() {
  String binaryStr = '1010';
  BigInt? decimalValue = BigInt.tryParse(binaryStr, radix: 2);
  if (decimalValue != null) {
    print('Parsed binary to decimal: $decimalValue');
  } else {
    print('Invalid input');
  }
}

Output

Parsed binary to decimal: 10

Summary

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