eyre | trait object based error handling type | Architecture library
kandi X-RAY | eyre Summary
kandi X-RAY | eyre Summary
[Build Status][actions-badge]][actions-url] [Rust Documentation] [actions-badge]: [actions-url]: This library provides [eyre::Report][Report], a trait object based error handling type for easy idiomatic error handling and reporting in Rust applications. This crate is a fork of [anyhow] with a support for customized error reports. For more details on customization checkout the docs on [eyre::EyreHandler].
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QUESTION
i'm trying to to add data to the main App through an reusable component, the problem is that when i use setState, nothing is happening.
In the main app, i m calling the BookModal and passing the
...ANSWER
Answered 2021-Dec-09 at 08:07This code has some problems, but I think the main one is conceptual. One of the things that React encourages you to do is to find the least amount of state possible.
In your app, the App component appears to handle the application's state. It tracks the data that you'll need to display in various ways, namely the list of books. Then, as you should, you pass this data, as props, down to a child component that will handle displaying this data, in this case a modal.
Where you go wrong is what you do next. The component should only care about displaying the props it's given, and yet you spend a lot of code basically storing the props in BookModal's state. Why? BookModal has everything it needs in the props it was passed.
"But," you'll say, "the modal has a form that the user will use to add a new book. How will the child component, BookModal, pass that data to the parent, App?" The answer is that it won't! App tracks the state, so App should expose a function to its children that can add a book to the state. How do you get this to the child? Pass it as a prop! The only state BookModal needs is that which will allow it to control the form components.
QUESTION
I am writing a Groovy script to parse the following json string. I am brand new to Groovy and Java, so if I'm missing something obvious, then I will thank you in advance for your patience.
...ANSWER
Answered 2021-Oct-16 at 17:16note that in json you have arrays [...] and maps {...}
QUESTION
I would like to write some code in a "functional programming" style.
However, I start with an Iterator of Results and I only want to apply the function to the Ok items. Furthermore, I want to stop the iteration on the first error (however, I'd be open to different behavior).
So far, I am using a nested map() pattern: .map(|l| l.map(replace)). I think this is extremely ugly.
Using the nightly "result_flattening", I can flatten each nested Result, E> into a Result. Using eyre::Context I convert the different Error types into an eyre::Report error type. All of this feels quite clumsy.
What is an elegant way to write this in Rust?
Minimal Working Example ...ANSWER
Answered 2020-Dec-05 at 20:12Since you discard the error type anyway, you can avoid eyre entirely and use .ok to convert the Result into an Option, then just work with Option's and_then to avoid flattening every time:
QUESTION
I am bit surprised that the default (native) implementation of the hashCode() method appears ~50x slower than a simple override of the method for the following benchmark.
Consider a basic Book class that does not override hashCode():
ANSWER
Answered 2020-Nov-16 at 17:31The performance difference is due to the fact that you are creating a new object for each hashCode() invocation in the benchmark, and the default hashCode() implementation caches its value in the object header, while the custom one obliviously does not. Writing to the object header takes a lot of time, since it involves a native call.
Repeated invocations of the default hashCode() implementation perform a little better than the custom one.
If you set -XX:-UseBiasedLocking, you will see that the performance difference decreases. Since biased locking information is stored in object headers too, and disabling it affects object layout, this is an additional proof.
QUESTION
I am trying to simulate data-entry for a form in vanilla Javascript. I cannot manipulate the HTML.
My code works fine until the final save button is clicked and then the filled-in inputs are cleared. How can I fill in the inputs and make sure that the data does not get cleared when I click on the final Save button?
HTML:
...ANSWER
Answered 2020-Apr-02 at 08:25Your code example appears incomplete, but I assume those elements are inside a form element, and the button is a button element with type="submit", and the button is inside the form.
If you want to prevent the submit button from posting the form, then you'll need to prevent the default behavior:
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