You might think something like “don’t request the same resource thousands of times a day, especially when it explicitly tells you it should be considered fresh for 90 days” would be obvious, but unfortunately it seems not.

Any software that makes HTTP requests to other sites should make it straightforward to enable the use of a cache.

                                        “Ajax, one of the gods dwelling on Olympus, in a prophet’s shape, tells us both to fight on by the ships. For that man was no prophet Calchas,                                                [70] who reads our omens. It was easy for me, as he went away, to see that from the back                                 80 by the markings on his feet and legs. Besides, it’s easy to recognize the gods.

Note that the <WarningEngine/> component must be at the bottom of the form to guarantee that all the fields have registered.

As The Social Dilemma shows, entertainers are in no rush to hold us, or themselves, accountable.

It seems like a waste of money to hire an actor to play the “algorithm guy” when there are actual algorithm creators being interviewed in the film.

// Use `noConflict` to restore the pre-fp variant. var fp = _.noConflict();

Sometimes we can’t implement a solution that’s fully spec-compliant, and in those cases using a polyfill might be the wrong answer. A polyfill would translate into telling the rest of the codebase that it’s okay to use the feature, that it’ll work just like in modern browsers, but it might not in edge cases.

Polyfills are naughty as they patch native APIs, while ponyfills are pure and don't affect the environment.

How are ponyfills better than polyfills? A polyfill is code that adds missing functionality by monkey patching an API. Unfortunately, it usually globally patches built-ins, which affects all code running in the environment. This is especially problematic when a polyfill is not fully spec compliant (which in some cases is impossible), as it could cause very hard to debug bugs and inconsistencies. Or when the spec for a new feature changes and your code depends on behavior that a module somewhere else in the dependency tree polyfills differently. In general, you should not modify API's you don't own.

It’s a risky blanket statement that causes bloat by including all the mistakes you made while building the original product.

mixing the turing complete of javascript with the markup of HTML eliminates the readability of JSX so that it is actually harder to parse than a solution like hyperscript

I'm okay with an overall design that allows people to plugin the parts they need in order to be able to generically support a compile-to-javascript language, but to bake in support for one singular solution because its popular is simply bad engineering.

Of all the compile-to-languages, the one that strikes me as having the least merit is JSX. It's basically a ton of added complexity for the sake of what boils down to syntax. There are no real gains in terms of language semantics in JSX.

One of the primary tasks of engineers is to minimize complexity. JSX changes such a fundamental part (syntax and semantics of the language) that the complexity bubbles up to everything it touches. Pretty much every pipeline tool I've had to work with has become far more complex than necessary because of JSX. It affects AST parsers, it affects linters, it affects code coverage, it affects build systems. That tons and tons of additional code that I now need to wade through and mentally parse and ignore whenever I need to debug or want to contribute to a library that adds JSX support.

Without elegant ways of expressing loops/iterators (like angular does with directives), the primary way to keep JSX readable thus becomes copying and pasting.

Furthermore, JSX encourages bad non-dry code. Having seen a lot of JSX over the past few months, its encourages copypasta coding.

Supporting JSX out of the box is the engineering equivalent of Mozilla supporting DRM out of the box in FireFox.

@subfuzion That error looks unrelated to the existing discussion.

Doesn't require the use of transpiler or modifications to all JS tooling ever invented.

Other frameworks, which use a template syntax built atop HTML — Svelte, Vue, Ractive, Glimmer etc — have historically been fragmented, meaning those tools need to be reinvented many times.

Right, and if most uses of an FTP service use new FtpService() the one that sets an alternate port will stand out (service.SetPort(12345))

This proposal simplifies how React.createElement works and ultimately lets us remove the need for forwardRef.

I recommend folks use https://github.com/shama/bel instead of this package; we've been working hard on it for the past two years to make sure it has all the features you could want to write inline HTML. Hope it's good; closing for now!

Yet it can be deceivingly difficult to properly encode (user) input

Encoding is dependent on the type of output - which means that for example a string, which will be used in a JavaScript variable, should be treated (encoded) differently than a string which will be used in plain HTML.

However, this would lead to further divergence. Tooling that is built around the assumptions imposed by template literals wouldn't work. It would undermine the meaning of template literals. It would be necessary to define how JSX behaves within the rest of the ECMAScript grammar within the template literal anyway.

Why not just use that instead of inventing a syntax that's not part of ECMAScript?

http://facebook.github.io/jsx/#why-not-template-literals (respectfully disagree)

This is valid javascript! Or harmony or es6 or whatever, but importantly, it's not happening outside the js environment. This also allows us to use our standard tooling: the traceur compiler knows how to turn jsx`<div>Hello</div>`; into the equivalent browser compatible es3, and hence we can use anything the traceur compile accepts!

This balancing act needs to take into account project complexity (size, distribution, etc.), uncertainty (risk, innovation need, etc.), and the cost of change at the project level and for each major component.

Compounding the problem of iteration disguised as oscillation is the cost of change.

A style guide is about consistency. Consistency with this style guide is important. Consistency within a project is more important. Consistency within one module or function is the most important.

However, know when to be inconsistent -- sometimes style guide recommendations just aren't applicable.

When applying the guideline would make the code less readable, even for someone who is used to reading code that follows this PEP.

An onevent event handler property serves as a placeholder of sorts, to which a single event handler can be assigned. In order to allow multiple handlers to be installed for the same event on a given object, you can call its addEventListener() method, which manages a list of handlers for the given event on the object.

But the vast majority of things that our apps are doing are just conditional and list rendering.

It would be cool though to have a framework that does not add any specific limitations

Svelte chooses a reverse approach.

This is a very dangerous practice as each optimization means making assumptions. If you are compressing an image you make an assumption that some payload can be cut out without seriously affecting the quality, if you are adding a cache to your backend you assume that the API will return same results. A correct assumption allows you to spare resources. A false assumption introduces a bug in your app. That’s why optimizations should be done consciously.

Moreover, React team even removed the “highlight updates” feature from dev tools because people used to obsessively haunt wasted renders with no reasoning behind it

In the vast majority of cases there’s nothing wrong about wasted renders. They take so little resources that it is simply undetectable for a human eye. In fact, comparing each component’s props to its previous props shallowly (I’m not even talking about deeply) can be more resource extensive then simply re-rendering the entire subtree.

"The Map is not the territory" —Alfred Korzybski

Alfred Korzybski remarked that "the map is not the territory" and that "the word is not the thing", encapsulating his view that an abstraction derived from something, or a reaction to it, is not the thing itself.

The map–territory relation describes the relationship between an object and a representation of that object, as in the relation between a geographical territory and a map of it.

"The menu is not the meal."

A map is not the territory it represents, but, if correct, it has a similar structure to the territory, which accounts for its usefulness.

MDX seeks to make writing with Markdown and JSX simpler while being more expressive. Writing is fun again when you combine components, that can even be dynamic or load data, with the simplicity of Markdown for long-form content.

Why?

An alternative (maybe not good) would be to restrict {@const} to certain blocks like {#each} and {#if}. In both cases, it significantly reduces the "multiple ways to do the same thing" problem and avoids ergonomic and performance overhead of our current situation.

it also allows for more divergence in how people write there code and where they put their logic, making different svelte codebases potentially even more different due to fewer constraints. This last point is actually something I really value, I read a lot of Svelte code by a lot of different people and broadly speaking things look the same and are in the same places.

Example with fantasy syntax:

(One can already destructure the loop variable but using a store obtained that way currently throws an error - Stores must be declared at the top level of the component (this may change in a future version of Svelte))

Generally, you should read the value of a store by subscribing to it and using the value as it changes over time. Occasionally, you may need to retrieve the value of a store to which you're not subscribed. get allows you to do so.

To fix our Svelte version you might think we could use beforeUpdate or afterUpdate, but these lifecycle functions are related to the DOM being updated, not to prop updates. We only want to rerun our fetching when the album prop is changed.

I'm suggesting there should be a way to write lifecycle related code that also responds to changing props, like how useEffect works. I think how React handles this could be a good source of inspiration.

I'm not sure I understand the problem, everything you are describing is already possible.

Svelte doesn't re-render, so you need to respond to component mount/dismount and prop changes separately as they are distinct concepts and never tied together, unlike in React.

While react hooks were one of the catalysts for v3 we don't agree with with the APIs or the model and won't be emulating it.

object orientation

It provides several capabilities that are difficult to achieve with React alone, while being compatible with the newest features of React.

I’d still be interested in Svelte making things easier so I’ve opened a feature request for Reactive statement cleanup functions.

Disclaimer: I’m new to Svelte so this isn’t so much a recommendation as it is a “I guess this is a way to do it 🤷‍♂️”

Sometimes, you may be tempted to write that wrapper. Because all your (React or Vue or insert your reactive framework here) instincts tell you so.Resist the temptation. There is a better way. A svelter way. Introducing: the use-directive (a.k.a. “actions”).

However, especially when starting out, it’s very easy to fall into the “this is how I did things in my previous framework” trap.

Meanwhile, politicians from the two major political parties have been hammering these companies, albeit for completely different reasons. Some have been complaining about how these platforms have potentially allowed for foreign interference in our elections.3 3. A Conversation with Mark Warner: Russia, Facebook and the Trump Campaign, Radio IQ|WVTF Music (Apr. 6, 2018), https://www.wvtf.org/post/conversation-mark-warner-russia-facebook-and-trump-campaign#stream/0 (statement of Sen. Mark Warner (D-Va.): “I first called out Facebook and some of the social media platforms in December of 2016. For the first six months, the companies just kind of blew off these allegations, but these proved to be true; that Russia used their social media platforms with fake accounts to spread false information, they paid for political advertising on their platforms. Facebook says those tactics are no longer allowed—that they've kicked this firm off their site, but I think they've got a lot of explaining to do.”). Others have complained about how they’ve been used to spread disinformation and propaganda.4 4. Nicholas Confessore & Matthew Rosenberg, Facebook Fallout Ruptures Democrats’ Longtime Alliance with Silicon Valley, N.Y. Times (Nov. 17, 2018), https://www.nytimes.com/2018/11/17/technology/facebook-democrats-congress.html (referencing statement by Sen. Jon Tester (D-Mont.): “Mr. Tester, the departing chief of the Senate Democrats’ campaign arm, looked at social media companies like Facebook and saw propaganda platforms that could cost his party the 2018 elections, according to two congressional aides. If Russian agents mounted a disinformation campaign like the one that had just helped elect Mr. Trump, he told Mr. Schumer, ‘we will lose every seat.’”). Some have charged that the platforms are just too powerful.5 5. Julia Carrie Wong, #Breaking Up Big Tech: Elizabeth Warren Says Facebook Just Proved Her Point, The Guardian (Mar. 11, 2019), https://www.theguardian.com/us-news/2019/mar/11/elizabeth-warren-facebook-ads-break-up-big-tech (statement of Sen. Elizabeth Warren (D-Mass.)) (“Curious why I think FB has too much power? Let's start with their ability to shut down a debate over whether FB has too much power. Thanks for restoring my posts. But I want a social media marketplace that isn't dominated by a single censor. #BreakUpBigTech.”). Others have called attention to inappropriate account and content takedowns,6 6. Jessica Guynn, Ted Cruz Threatens to Regulate Facebook, Google and Twitter Over Charges of Anti-Conservative Bias, USA Today (Apr. 10, 2019), https://www.usatoday.com/story/news/2019/04/10/ted-cruz-threatens-regulate-facebook-twitter-over-alleged-bias/3423095002/ (statement of Sen. Ted Cruz (R-Tex.)) (“What makes the threat of political censorship so problematic is the lack of transparency, the invisibility, the ability for a handful of giant tech companies to decide if a particular speaker is disfavored.”). while some have argued that the attempts to moderate discriminate against certain political viewpoints.

I just wrote a long, considered, friendly, and I hope helpful comment here but -- sorry, I have to see the irony in this once again -- your system wouldn't let me say anything longer tahn 1,500 characters. If you want more intelligent conversations, you might want to expand past soundbite.

Capitalists and market-thinkers inevitably seek to enclose the commons, privatizing benefits and externalizing costs onto society.

Mr. Duncombe published the results online using CommentPress, open-source software by the Institute for the Future of the Book. Online discussion and commenting is made possible by Social Book, a social-reading platform created by the institute.

Anyone who's dealt with networks knows that the network knows more than the individual."

Conservatives have fought for schools to promote patriotism, highlight the influence of Christianity and celebrate the founding fathers. In a September speech, President Trump warned against a “radical left” that wants to “erase American history, crush religious liberty, indoctrinate our students with left-wing ideology.”

 recording it all in a Twitter thread that went viral and garnered the hashtag  #PlaneBae.

web we lost

It's the part of your garden that you might actively show people when they come round to visit, that you're most proud of.

Put another way, many tools for thought are public goods. They often cost a lot to develop initially, but it’s easy for others to duplicate and improve on them, free riding on the initial investment. While such duplication and improvement is good for our society as a whole, it’s bad for the companies that make that initial investment. And so such tools for thought suffer the fate of many public goods: our society collectively underinvests in them, relative to the benefits they provide

Solid supports templating in 3 forms JSX, Tagged Template Literals, and Solid's HyperScript variant.

Why struggle with custom Syntax DSLs when you can use one so widely supported?

It was only pragmatic to use a tool that basically gives you that all for free.

So while Solid's JSX and might resemble React it by no means works like React and there should be no illusions that a JSX library will just work with Solid. Afterall, there are no JSX libraries, as they all work without JSX, only HyperScript or React ones.

Solid’s State primitive is arguably its most powerful and distinctive one. Through the use of proxies and explicit setters it gives the control of an immutable interface and the performance of a mutable one

People constantly suggest that I should have just worked with a different library instead of writing another one.

If there was a place I thought reactivity would be weak, I embraced it and I worked on it until I was happy with the results.

focuses way too much on the getter/tracking part of the equation which is really the part you want reduce the mental bandwidth on

I started Solid years ago before I thought anyone would be interested in using it. I only started promoting it because it had already achieved the goals I had set out for it.

There's one downside to Reacts reactivity model - the hooks (useState and useEffect) have to always be called in the same order and you can't put them inside an if block.

createState and createSignal are improvements over React's useState as it doesn't depend on the order of calls.

It's designed for Single Page Applications (SPA). If you need Server Side Rendering then consider using Sapper.

For an API used by many third parties with many diverse uses cases, GraphQL is the right tool.

If a part of the content deserves its own heading, and that heading would be listed in a theoretical or actual table of contents, it should be placed in a <section>. The key exception is where the content may be syndicated; in this case, use <article> element instead.

This issue has been resolved in version 9.1.9

both copied much of their API from Redux Form, so, despite working very differently under the hood, there is a lot of overlap in their APIs.

But maybe this PR should still be merged until he finds time for that?

Whilst

I created a pull request to have the if (node.parentNode) conditional added to detach. It was not applied due to the desire to find the root cause of the <meta> tag manifestation of this issue.

Ontologically

I don't read comments as I think they are dangerous

Why the obfuscation of remaining to r and callbacks to c? This is fine for function-local variables but in this instance makes the code significantly harder to reason about? There is no notion of what c and r mean.

remaining: 0, callbacks: [] r: 0, // remaining outros c: [], // callbacks p: outros // parent group

If you’ve used Flow before, the syntax is fairly similar. One difference is that we’ve added a few restrictions to avoid code that might appear ambiguous.

let:hovering={active}

let:active={hovering}

Because Svelte is a compiler, we're not bound to the peculiarities of JavaScript: we can design a component authoring experience, rather than having to fit it around the semantics of the language.

Why do we use bundlers again?Historically, bundlers have been used in order to support CommonJS files in the browser, by concatenating them all into a single file. Bundlers detected usages of require() and module.exports and wrap them all with a lightweight CommonJS runtime. Other benefits were allowing you to serve your app as a single file, rather than having the user download several scripts which can be more time consuming.

Wow, no answers to this question. That's too bad. Did you ever find the solution?

You can see that Rollup mapped browser globals called "React" and "ReactDOM" to variables called "React" and "ReactDOM". The latter are what you imported by writing import React and import ReactDOM. (The variable names don't have to be the same as the browser globals, but it's common.)

But library users are more numerous, and so their needs are more important.

remember that the needs of the many outweigh the needs of the few

small modules allow library authors to become lazy. Why include that six-line helper function when you can do a one-line `require`?

These are all things that make your life as a library author easier.

possibly making it harder for them to appreciate how severe the discoverability issues are for the rest of us.

The natural assumption is that this is because a) it is the best package manager, and b) the JavaScript community is the most energetic and productive.

I think I know why: it’s because the small modules philosophy favours library authors (like Sindre) at the ultimate expense of library users.

The Why