toString method

  1. @override
String toString()
override

Returns a non-empty string representation of this Optional suitable for debugging.

If a value is present the result includes its string representation. Empty and present Optionals are unambiguously differentiable.

Returns the string representation of this instance.

Example

Optional<String> name = Optional.of("Olivia");
Optional<String> empty = Optional.empty();
Optional<int> number = Optional.of(42);

print(name.toString()); // "Optional[Olivia]"
print(empty.toString()); // "Optional.empty"
print(number.toString()); // "Optional[42]"

// Useful for debugging
void debugOptional(Optional<String> opt) {
  print("Debug: $opt");
}

debugOptional(name); // Debug: Optional[Olivia]
debugOptional(empty); // Debug: Optional.empty

Implementation

@override
String toString() {
  return _value != null ? 'Optional[$_value]' : 'Optional.empty';
}