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Seems easy, right? How about the below code, what will it print? new Promise((_, reject) => reject(new Error('woops'))). catch(error => { console.log('caught', err.message); }); It'll print out an unhandled rejection warning. Notice that err is not defined!

Even if #foo is originally on the page and then removed and replaced with a #foo which contains baz after a short wait, Capybara will still figure this out.

As long as you stick to the Capybara API, and have a basic grasp of how its waiting behaviour works, you should never have to use wait_until explicitly.

Let’s make that really clear, Capybara is ridiculously good at waiting for content.

apybara could have easily figured out how to wait for this content, without you muddying up your specs with tons of explicit calls to wait_until. Our developer could simply have done this: page.find("#foo").should have_content("login failed")

All these problems are solved in zeitwerk mode, it just works as expected, and require_dependency should not be used anymore, it is no longer needed.

And on any given day, developing with Svelte and its reactive nature is simply a dream to use. You can tell Svelte to track state changes on practically anything using the $: directive. And it’s quite likely that your first reactive changes will produce all the expected UI results.

Good catch, @Hokascha. The project claims support for cross-domain iframes, but reading the docs reveals that it does still require server access to the embedded domain.

Notice the use of Enter key after backslash in the sed command.

Many designers strive to create products that are so easy to navigate, their users can flow through them at first glance. To design something with this level of intuitiveness, it’s imperative designers understand affordances—what they are and how to use them.

Svelte is there when I need it with useful APIs, but fades into the background as I put my app together.

So why the over-complication? What we got now is replicating a chain of && in the former version. This time, however, you will know which condition failed and what went in by using tracing. Look at the trace above - it’s impossible to not understand what was going on.

Now you can easily spot them! The rule is: if you see a Result it means that this function can throw an exception. And you even know its type in advance.

we also wrap them in Failure to solve the second problem: spotting potential exceptions is hard

Almost everything in python can fail with different types of exceptions: division, function calls, int, str, generators, iterables in for loops, attribute access, key access, even raise something() itself may fail. I am not even covering IO operations here. And checked exceptions won’t be supported in the nearest future.

You still need to have a solid experience to spot these potential problems in a perfectly readable and typed code.

print will never be actually executed. Because 1 / 0 is an impossible operation and ZeroDivisionError will be raised.

If you teach your users to trust that URL bar is supposed to not change when they click links (e.g. your site uses a big iframe with all the actual content), then the users will not notice anything in the future either in case of actual security vulnerability.

The point is, just because you don’t see it, doesn’t mean it’s not happening. It’s been more than two years and as far as I know, no one has ever noticed one of my requests. Maybe it’s been in your site this whole time

Can we just forward/bubble all events emitted by the underlying input element?

Good risk management is inherently simple; adding too many complexities increases the likelihood of overlooking the obvious.

The problem I have with this approach to state and prop variables is that the difference between them is very blurry. In React you can clearly see that a prop is an input to component (because of clear function notation), and that state is something internal. In Svelte they are both just variables, with the exception that props use export keyword.

Just throwing in <div class="{$$props.class || ''} otherChildClass"></div> seems the easiest, and it'll avoid undefined classes. I feel like many aren't noticing the undefined values getting inserted in their classes.

I reckon that it was: less a communication failure more a failure to pay attention – no disrespect intended. Given the unfortunate coincidence, it's almost entirely understandable that everyone concerned lost sight of Mozilla's forewarning.