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reactjs - React Hook "useState" is called in function "app" which is neither a React function component or a custom React Hook function

I'm trying to use react hooks for a simple problem const [personState,setPersonState] = useState({ DefinedObject } ... }; export default person; See Question&Answers more detail:os...

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rust - How do I create a HashMap literal?

How I can create a HashMap literal in Rust? In Python I can do it so: hashmap = { 'element0': { 'name': 'My New ... , map[string]Node {} } } } } See Question&Answers more detail:os...

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javascript - Google Chrome Extensions: How to include jQuery in programmatically injected content script?

I'm injecting my content script from the background page when the user clicks the browser action button, ... to inject that simultaneously. See Question&Answers more detail:os...

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ios - How to get RGB values from UIColor?

I'm creating a color object using the following code. curView.backgroundColor = [[UIColor alloc] initWithHue:229 ... the created color object? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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objective c - Finding the Current Active Window in Mac OS X using Python

Is there a way to find the application name of the current active window at a given time on Mac OS X using Python? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - Is [CallerMemberName] slow compared to alternatives when implementing INotifyPropertyChanged?

There are good articles that suggest different ways for implementing INotifyPropertyChanged. Consider the following basic ... use reflection? See Question&Answers more detail:os...

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objective c - '+entityForName: nil is not a legal NSManagedObjectContext parameter - Core Data

I have added all of the relevant code to the App Delegate, and I am able to add to the data model and ... on? Any help would be appreciated. See Question&Answers more detail:os...

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angular - Uncaught Error: Unexpected directive 'MyComboBox' imported by the module 'AppModule'. Please add a @NgModule annotation

I've a custom component (MyComboBox) which has kendo-combobox inside. When I use my core module, webpack ... bootstrap: [AppComponent] }) See Question&Answers more detail:os...

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java - Can I use a GitHub project directly in Maven?

I am interested in using a project on GitHub as a dependency in my project. The GitHub project has a pom file. ... is my best course of action? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ios - Objective-C: Where to remove observer for NSNotification?

I have an objective C class. In it, I created a init method and set up a NSNotification in it //Set up ... I just created an objective c Class? See Question&Answers more detail:os...

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c# - Non client painting on aero glass window

Now Im customizing title bar of my application. My aim is to add one extra button on title bar. Im my ... ] Thank you everybody for answers! See Question&Answers more detail:os...

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xcode - Missing symbol names when profiling IPhone application with Instruments

I am compiling an IPhone application via command line (so no XCode options involved) and I am unable to ... help will be greatly appreciated! See Question&Answers more detail:os...

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Asp.Net MVC: How do I enable dashes in my urls?

I'd like to have dashes separate words in my URLs. So instead of: /MyController/MyAction I'd like: /My-Controller/My-Action Is this possible? See Question&Answers more detail:os...

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Android Studio 2.0 - Plugin is too old, please update to a more recent version, or set ANDROID_DAILY_OVERRIDE environment variable to

I updated the Android Studio version 2.0 and was using normally. When I created a new project today, it is ... ) { delete rootProject.buildDir } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - Entity Framework - Invalid Column Name '*_ID"

I've narrowed this down to some issue between Code First and Database first EF, but I'm not sure how to ... stop the invalid column name error? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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javascript - Using forEach on an array from getElementsByClassName results in “TypeError: undefined is not a function”

In my JSFiddle, I'm simply trying to iterate over an array of elements. The array is non-empty, as the log ... <div class="myClass">Hello</div> See Question&Answers more detail:os...

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Is there an equivalent of Scala's Either in Java 8?

Just like java.util.Optional<T> in Java 8 is (somewhat) equivalent to Scala's Option[T] type, is there an equivalent to Scala's Either[L, R]? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Do objects pushed into an array in javascript deep or shallow copy?

Pretty self evident question...When using .push() on an array in javascript, is the object pushed into the array ... (deep) regardless of type. See Question&Answers more detail:os...

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javascript - How to handle window scroll event in Angular 4?

I can't seem to be able to capture the Window scroll event. On several sites I found code similar to this: ... m missing? Thank you very much! See Question&Answers more detail:os...

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sql - Normalization in plain English

I understand the concept of database normalization, but always have a hard time explaining it in plain English ... the interviewers looking for? See Question&Answers more detail:os...

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android - Difference between a clickable ImageView and ImageButton

I'm just wondering if there is any significant difference between an ImageView that's set to be ... clickable ImageView over ImageButton? See Question&Answers more detail:os...

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python - How to *actually* read CSV data in TensorFlow?

I'm relatively new to the world of TensorFlow, and pretty perplexed by how you'd actually read CSV data ... .request_stop() coord.join(threads) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c# - How to make Check Box List in ASP.Net MVC

I have a form with a list of checkboxes. A user can select all values, no values, or any in between. ... Controller into a comma separated list? See Question&Answers more detail:os...

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objective c - Dynamic forwarding: suppress Incomplete Implementation warning

I have a class exposing some methods, whose implementation is provided by an inner object. I'm using forward ... warning in XCode exists. See Question&Answers more detail:os...

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c++ - Get home directory in Linux

I need a way to get user home directory in C++ program running on Linux. If the same code works on Unix, ... my program is running by root user? See Question&Answers more detail:os...

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How to connect mySQL database using C++

I'm trying to connect the database from my website and display some rows using C++. So bascily I'm trying ... what libraries I should be using? See Question&Answers more detail:os...

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c# - Creating simple c++.net wrapper. Step-by-step

I've a c++ project. I admit that I'm a complete ZERO in c++. But still I need to write a c++.net ... reference to an unmanaged library. S.O.S. See Question&Answers more detail:os...

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Does python have a sorted list?

By which I mean a structure with: O(log n) complexity for x.push() operations O(log n) complexity to find an ... insert(...) which is now here. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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