Explanation of a statement by its result

I know, 42 is the answer to everything but how the heck is `42` the result of this? ``` int x = -(~'+'|0xAB^1337); //42 ```

2 Jun at 14:23

How to merge multiple dataframes

I have different dataframes and need to merge them together based on the date column. If I only had two dataframes, I could use `df1.merge(df2, on='date')`, to do it with three dataframes, I use `df1....

mapping values are not allowed in this context

I'm a novice regarding YAML format and kubernetes. The following is a file. ``` --- apiVersion: extensions/v1beta1 kind: Deployment metadata: labels: name: prometheus-deployment name: prome...

3 Nov at 05:12

Difference between DispatchQueue.main.async and DispatchQueue.main.sync

I have been using `DispatchQueue.main.async` for a long time to perform UI related operations.

 Swift provides both `DispatchQueue.main.async` and `DispatchQueue.main.sync`, and both are performed o...

Graph API - Insufficient privileges to complete the operation

When trying to access the Graph Service Client using I am receiving the error: > Code: Authorization_RequestDenied Message: Insufficient privileges to complete the operation. After researching this e...

SharePointOnlineCredentials Missing or not found

I have added Sharepoint reference in my project. Even after adding reference, it is showing: > SharePointOnlineCredentials Missing or not found. Can anyone suggest a solution?

5 Jun at 15:16

Room - Schema export directory is not provided to the annotation processor so we cannot export the schema

I am using Android Database Component Room I've configured everything, but when I compile, Android Studio gives me this warning: > Schema export directory is not provided to the annotation processor...

2 Jan at 06:34

Property 'value' does not exist on type EventTarget in TypeScript

So the following code is in Angular 4 and I can't figure out why it doesn't work the way as expected. Here is a snippet of my handler: ``` onUpdatingServerName(event: Event) { console.log(event); ...

18 Dec at 00:24

Fresh ASP.NET Core API returns empty JSON objects

I have made a .NET Core Web API project to test it out. My problem is, that the API returns an empty JSON object, when I request the endpoint, which is located at "/api/cars/123" for instance. This ...

2 Jun at 00:3

Flutter onTap method for Containers

Been developing a flutter app and dynamicly building some containers from some Firebase data. I wanted to know if there is a way to get a onTap method for containers (or any widget which is not a but...

1 Jun at 21:15

ssl.SSLError: tlsv1 alert protocol version

I'm using the REST API for a [Cisco CMX device](https://www.cisco.com/c/en/us/td/docs/wireless/mse/10-2/api/b_cg_CMX_REST_API_Getting_Started_Guide/b_cg_CMX_REST_API_Getting_Started_Guide_chapter_01.h...

2 Sep at 04:6

When to use 'raise NotImplementedError'?

Is it to remind yourself and your team to implement the class correctly? I don't fully get the use of an abstract class like this: ``` class RectangularRoom(object): def __init__(self, width, hei...

14 May at 12:46

Filter array of objects whose any properties contains a value

I'm wondering what is the cleanest way, better way to filter an array of objects depending on a `string keyword`. The search has to be made in any properties of the object. When I type `lea` I want to...

11 Aug at 13:5

React-router v4 this.props.history.push(...) not working

I'm trying to route programatically using `this.props.history.push(..)` but it doesn't seem to work. Here's the router: ``` import { BrowserRouter as Router, Route } from 'react-router-dom'; <Ro...

Set Authorization/Content-Type headers when call HTTPClient.PostAsync

Where can I set headers to REST service call when using simple HTTPClient? I do : ``` HttpClient client = new HttpClient(); var values = new Dictionary<string, string> { {"id", "111"}, {"am...

19 Jul at 18:11

How to null check c# 7 tuple in LINQ query?

Given: ``` class Program { private static readonly List<(int a, int b, int c)> Map = new List<(int a, int b, int c)>() { (1, 1, 2), (1, 2, 3), (2, 2, 4) }; sta...

22 Jun at 21:16

Semaphore Wait vs WaitAsync in an async method

I'm trying to find out what is the difference between the SemaphoreSlim use of Wait and WaitAsync, used in this kind of context: ``` private SemaphoreSlim semaphore = new SemaphoreSlim(1); public asy...

How to create a JSONObject from String in Kotlin?

I need to convert a string `{\"name\":\"test name\", \"age\":25}` to a JSONObject

31 May at 22:36

Angular 2 ngfor first, last, index loop

I'm trying to set as default the first occurrence in this example: [plunkr](https://plnkr.co/edit/tGZVAbJZpYDxxmKyPRKg?p=preview) getting the following error: ``` Unhandled Promise rejection: Template...

13 Aug at 06:28

Is it possible to use ValueTuple as model in View?

Is it possible to use value tuples as model type in views in ASP.NET Core MVC? I mean like this: Controller: public IActionResult Index() { ... (int ImportsCount, int ExportsCount) impor...

6 May at 00:58

servicestack ormlite postgres connection timeout

From release 1.0.41 have some issue with ormlite. Connection takes long time and expires but command itself is executed. I also tried to use 1.0.42 but it is same issue. ``` <PackageReference Include...

How do I validate configuration with the automapper Instance API

I know that using automapper's static API I can do this: ``` Mapper.Initialize(cfg => cfg.CreateMap<Source, Destination>()); Mapper.Configuration.AssertConfigurationIsValid(); ``` but now I've ...

31 May at 13:46

The controller for path '/apple-touch-icon-120x120-precomposed.png' was not found

I am getting some error messages in my web log file. 1. The controller for path '/apple-touch-icon-120x120-precomposed.png' was not found or does not implement IController. Path::/apple-touch-icon-120...

6 May at 18:48

Why is it impossible to call static methods on Nullable<T> shorthands?

I thought `T?` is just a compiler shorthand for `Nullable<T>`. According to [MSDN](https://learn.microsoft.com/en-us/dotnet/csharp/programming-guide/nullable-types/): > The syntax `T?` is shorthand f...

31 May at 12:57

Entity Framework Core: private or protected navigation properties

Is it somehow possible to define navigation properties in EFCore with private or protected access level to make this kind of code work: ``` class Model { public int Id { get; set; } virtual pro...