functional-programming

问题 I'm trying to map my JSONArray to a Array<String?> . I'm doing it like this: fun getTextResponse(responseJson: JSONObject): Array<String?>{ val resultData = responseJson.getJSONArray("data") .getJSONObject(0) .getJSONArray("result") return resultData.map{ it.getString("label") }.toTypedArray() } But it is not typed as a JSONObject , is there any way I can force type it to JSONObject ? 回答1: The problem is that resultData has a type of JSONArray , which is a JSON utility class that doesn't

问题 I'm trying to map my JSONArray to a Array<String?> . I'm doing it like this: fun getTextResponse(responseJson: JSONObject): Array<String?>{ val resultData = responseJson.getJSONArray("data") .getJSONObject(0) .getJSONArray("result") return resultData.map{ it.getString("label") }.toTypedArray() } But it is not typed as a JSONObject , is there any way I can force type it to JSONObject ? 回答1: The problem is that resultData has a type of JSONArray , which is a JSON utility class that doesn't

问题 I understand this kind of breaks the idea of using project-reactor involving switching, but I am wondering if there is an appropriate way to handling this routing scenario given. Major Edit: I just went ahead and tried a more presentable implementation of the concept. Is there a significant issue with the given implementation? public interface MonoPipe<I> { public Mono<I> process(Mono<I> mono); } public static <I,P extends MonoPipe<I>> Mono<I> append(Mono<I> init, Collection<P> monoPipes){

问题 I have one function sub _where(\@ \&) which takes 2 arguments: the first is an array, and the second should be another function. This other function returns a boolean value, and I want to call it inside my for loop of sub _where(\@ \&) function. I am having trouble extracting the function I am passing in into a custom local name. I think I do need some local name for it, because it should be possible to pass different boolean functions to my where function. where: sub _where(\@ \&) { my @stud

问题 I have one function sub _where(\@ \&) which takes 2 arguments: the first is an array, and the second should be another function. This other function returns a boolean value, and I want to call it inside my for loop of sub _where(\@ \&) function. I am having trouble extracting the function I am passing in into a custom local name. I think I do need some local name for it, because it should be possible to pass different boolean functions to my where function. where: sub _where(\@ \&) { my @stud

问题 I have one function sub _where(\@ \&) which takes 2 arguments: the first is an array, and the second should be another function. This other function returns a boolean value, and I want to call it inside my for loop of sub _where(\@ \&) function. I am having trouble extracting the function I am passing in into a custom local name. I think I do need some local name for it, because it should be possible to pass different boolean functions to my where function. where: sub _where(\@ \&) { my @stud

问题 I have one function sub _where(\@ \&) which takes 2 arguments: the first is an array, and the second should be another function. This other function returns a boolean value, and I want to call it inside my for loop of sub _where(\@ \&) function. I am having trouble extracting the function I am passing in into a custom local name. I think I do need some local name for it, because it should be possible to pass different boolean functions to my where function. where: sub _where(\@ \&) { my @stud

问题 Does Boost Hana provide a way to combine predicates with logical operators? I'm referring to something roughly like this constexpr auto both = [](auto&& f, auto&& g){ return [&f,&g](auto&& x){ return f(x) && g(x); }; }; that could be used like this: int main() { std::vector<int> v{1,2,3,4,5,6,7,8,9,10}; auto less_than_7 = hana::reverse_partial(std::less_equal<int>{}, 7); auto more_than_3 = hana::reverse_partial(std::greater_equal<int>{}, 3); auto r = ranges::views::remove_if(v, both(less_than

问题 I am generating an an array of categories and subcategories in my Laravel API for use in my client side app. I'm doing this by using the collection's filter and map methods to organize the data pulled from the database: // get the data from the category table $categoryData = $categories->all()->categories(); // filter the data by category names we know we want and create the multi-dimensional array of the fields we need $categoryList = $categoryData->filter(function ($value) { return $value[

问题 I am generating an an array of categories and subcategories in my Laravel API for use in my client side app. I'm doing this by using the collection's filter and map methods to organize the data pulled from the database: // get the data from the category table $categoryData = $categories->all()->categories(); // filter the data by category names we know we want and create the multi-dimensional array of the fields we need $categoryList = $categoryData->filter(function ($value) { return $value[