toarray

问题 I'm trying to build a category tree from a term collection in Mongo/Node, but first I select all tree elements using $in: console.time('termsCol.find'); var terms = await termsCol.find({term_id: {'$in': flatTree}}); console.timeEnd('termsCol.find'); console.time('termsCol.toArray'); terms = await terms.toArray(); console.timeEnd('termsCol.toArray'); This performs: termsCol.find: 0.162ms termsCol.toArray: 30.910ms I've read posts about toArray performance on SO, but would like to know if

问题 I have an interesting JSON parsing problem, at least to me since I am doing this for the first time. I have the following sample JSON and I want to map it to equivalent DTOs: { "modules": [ { "name":"module1", "shortId":23425, "pmns": [ { "name":"pmn1", "position":1, "pmnType":"D3" }, { "name":"pmn3", "position":3, "pmnType":"R2" }, { "name":"pmn7", "position":5, "pmnType":"S1" }, ] }, { "name":"module2", "shortId":1572, "pmns": [ { "name":"pmn1", "position":3, "pmnType":"D3" }, { "name":

问题 I have an interesting JSON parsing problem, at least to me since I am doing this for the first time. I have the following sample JSON and I want to map it to equivalent DTOs: { "modules": [ { "name":"module1", "shortId":23425, "pmns": [ { "name":"pmn1", "position":1, "pmnType":"D3" }, { "name":"pmn3", "position":3, "pmnType":"R2" }, { "name":"pmn7", "position":5, "pmnType":"S1" }, ] }, { "name":"module2", "shortId":1572, "pmns": [ { "name":"pmn1", "position":3, "pmnType":"D3" }, { "name":

问题 I have an interesting JSON parsing problem, at least to me since I am doing this for the first time. I have the following sample JSON and I want to map it to equivalent DTOs: { "modules": [ { "name":"module1", "shortId":23425, "pmns": [ { "name":"pmn1", "position":1, "pmnType":"D3" }, { "name":"pmn3", "position":3, "pmnType":"R2" }, { "name":"pmn7", "position":5, "pmnType":"S1" }, ] }, { "name":"module2", "shortId":1572, "pmns": [ { "name":"pmn1", "position":3, "pmnType":"D3" }, { "name":

问题 import java.util.*; public class multiple { public static int userNumber; public static int userChoice; static Stack<Object> stack = new Stack<Object>(); static int[] list = new int[100]; public static void main(String[] args) { introduction(); multiple(); printStack(stack); } public static void introduction() { Scanner input = new Scanner(System.in); System.out.print("Welcome to the program, please enter the number less than 100 that you would like " + "to find whoes number \nbelow have

问题 I've got a List collection and I want to iterate over it in a multi threaded app. I need to protect it every time I iterate it since it could be changed and I don't want "collection was modified" exceptions when I do a foreach. What is the correct way to do this? Use lock every time I access or loop. I'm rather terrified of deadlocks. Maybe I'm just paranoid of using lock and shouldn't be. What do I need to know if I go this route to avoid deadlocks? Is lock fairly efficient? Use List<>

问题 I have data in an html file, in a table: <table> <tr><td>001</td><td>MC Hammer</td><td>Can't Touch This</td></tr> <tr><td>002</td><td>Tone Loc</td><td>Funky Cold Medina</td></tr> <tr><td>003</td><td>Funkdoobiest</td><td>Bow Wow Wow</td></tr> </table> How do I split a single row into an array or list? string row = streamReader.ReadLine(); List<string> data = row.Split //... how do I do this bit? string artist = data[1]; 回答1: Short answer: never try to parse HTML from the wild with regular

问题 This should be a pretty basic question, but I've been having a little trouble finding a definite answer. When you have an array of values and you use the .ToArray() method does it create a deep or shallow copy of the array? 回答1: No. You can easily verify this by writing a small program to test. 来源： https://stackoverflow.com/questions/10387415/in-c-sharp-does-array-toarray-perform-a-deep-copy

问题 I have this query: Dim test = result.GroupBy(Function(row) groupedindexes.Select( Function(grpindex) row(grpindex)).ToArray, comp) I'm building an expression tree. I have already build the part inside the GroupBy function and now I would like to call the ToArray method. Here is the code: Public Function Grouping(ByVal result As IEnumerable(Of Object()), ByVal groupedindexes As List(Of Integer), ByVal comparer As compare) As Expression Dim groupbyMethod = GetType(Enumerable).GetMethods

问题 Right now, I have: public <T> T[] toArray(T[] old) { T[] arr = Arrays.copyOf(old, old.length + size()); int i = old.length; for(E obj : this) { arr[i] = old.getClass().getComponentType().cast(obj); ++i; } return arr; } (Note that this does not follow the contract as it was pointed out by axtavt.) where I get this warning: Type safety: Unchecked cast from capture#2-of ? to T Is this still the best / most straightforward way to implement it? Can I somehow code it in a way without that warning?