closure | Code of JavaScript functions & scope book | Rule Engine library

Basically, the problem at hand is that rodio::Decoder::new consumes the value which it reads from (well, actually it is already consumed by BufReader::new). So, if you have a loop or a closure that can be called multiple times, you have to come up with a fresh value each time. This what File::open does in your first code snipped.

In your second code snipped, you only create a File once, and then try to consume it multiple times, which Rust's ownership concept prevents you from doing.

Also notice, that using reference is sadly not really an option with rodio since the decoders must be 'static (see for instance the Sink::append trait bound on S).

If you think your file system is a bit slow, and you want to optimize this, then you might actually want to read the entire file up-front (which File::open doesn't do). Doing this should also provide you with a buffer (e.g. a Vec) that you can clone, and thus allows to repeatedly create fresh values that can be consumed by the Decoder. Here is an example doing this:

The reason seems to be explained in the source:

React is a framework that is state-based - the state informs the render of the DOM. Trying to use querySelector and its equivalent won't work like you think it will.

So here's an example of this working.

1. We set the state to be the index of the span (initially nothing).

2. handleClick which is attached to the div (or would be attached to your Scale element) grabs the data id attribute from the span and adds it to the state.

3. This triggers the page to re-render, the spans get rebuilt, and depending on the state the selected class gets added.

There is no other DOM manipulation going on. React does all that heavy lifting for you.

std::string_view doesn't Acquire Resource, it is not a RAII object.

You should use the FutureBuilder widget to update your user interface when the data is available. The code you provided attempts to build the widgets before the data is received. This causes the _historyList to still be null.

Your problem is that you have set SESSION_CONNECTION=session, but your SESSION_DRIVER=default, so you have to use SESSION_DRIVER=database in your .env. See the config/session.php:

#[tokio::main] converts your function into the following:

scaffoldMessengerKey.currentState.showSnackBar(mySnackBar); scaffoldMessengerKey.currentState.hideCurrentSnackBar(mySnackBar); scaffoldMessengerKey.currentState.removeCurrentSnackBar(mySnackBar);

If you move the chunk Option into the closure, your code compiles. I can't quite answer why declaring chunk outside the closure results in a lifetime error for the borrow of text inside the closure, but the chunk Option looks superfluous anyways and the following code should be equivalent: