enumAllConstants function
Implementation
List<String> enumAllConstants(List<List<String>> constantRules) {
if (constantRules.isEmpty) return <String>[];
var res = constantRules.reduce((value, element) {
if (value.isEmpty) {
return element;
} else if (element.isEmpty) {
return value;
} else {
return value
.expand<String>((innerValue) =>
element.map<String>((innerElement) => innerValue + innerElement))
.toList();
}
});
return res;
}