The parameter 'key' can't have a value of 'null' because of its type, but the implicit default value is 'null'.
int? maybeValue = 42;
int value = maybeValue!; // valid, value is non-nullableThe parameter 'key' can't have a value of 'null' because of its type, but the implicit default value is 'null'.
int? maybeValue = 42;
int value = maybeValue!; // valid, value is non-nullableThe parameter 'key' can't have a value of 'null' because of its type, but the implicit default value is 'null'.
int square(int value) {
assert(value != null); // for debugging
if (value == null) throw Exception();
return value * value;
}The parameter 'key' can't have a value of 'null' because of its type, but the implicit default value is 'null'.
void printAbs({int value}) { // 'value' can't have a value of null because of its type, and no non-null default value is provided
print(value.abs());
}
class Host {
Host({this.hostName}); // 'hostName' can't have a value of null because of its type, and no non-null default value is provided
final String hostName;
}The parameter 'key' can't have a value of 'null' because of its type, but the implicit default value is 'null'.
int square(int value) {
return value * value;
}The parameter 'key' can't have a value of 'null' because of its type, but the implicit default value is 'null'.
int sign(int x) {
int result; // non-nullable
print(result.abs()); // invalid: 'result' must be assigned before it can be used
if (x >= 0) {
result = 1;
} else {
result = -1;
}
print(result.abs()); // ok now
return result;
}The parameter 'key' can't have a value of 'null' because of its type, but the implicit default value is 'null'.
void printAbs({required int value}) {
print(value.abs());
}
class Host {
Host({required this.hostName});
final String hostName;
}The parameter 'key' can't have a value of 'null' because of its type, but the implicit default value is 'null'.
void main() {
int age; // non-nullable
age = null; // A value of type `Null` can't be assigned to a variable of type 'int'
}The parameter 'key' can't have a value of 'null' because of its type, but the implicit default value is 'null'.
class BaseUrl {
BaseUrl(this.hostName);
String hostName; // now valid
int port = 80; // ok
}Copyright © 2021 Codeinu
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