hashCode property

  1. @override
int get hashCode
override

Returns the hash code of the value, if present, otherwise 0 (zero) if no value is present.

Returns hash code value of the present value or 0 if no value is present.

Example

Optional<String> name = Optional.of("Noah");
Optional<String> empty = Optional.empty();

print(name.hashCode); // Same as "Noah".hashCode
print(empty.hashCode); // 0

// Useful for using Optionals as map keys
Map<Optional<String>, int> counts = {};
counts[Optional.of("apple")] = 5;
counts[Optional.empty()] = 0;

print(counts[Optional.of("apple")]); // 5
print(counts[Optional.empty()]); // 0

Implementation

@override
int get hashCode {
  return _value?.hashCode ?? 0;
}