- Jan 2022
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translational-medicine.biomedcentral.com translational-medicine.biomedcentral.com
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Liu, Y., Ebinger, J. E., Mostafa, R., Budde, P., Gajewski, J., Walker, B., Joung, S., Wu, M., Bräutigam, M., Hesping, F., Rupieper, E., Schubert, A.-S., Zucht, H.-D., Braun, J., Melmed, G. Y., Sobhani, K., Arditi, M., Van Eyk, J. E., Cheng, S., & Fert-Bober, J. (2021). Paradoxical sex-specific patterns of autoantibody response to SARS-CoV-2 infection. Journal of Translational Medicine, 19(1), 524. https://doi.org/10.1186/s12967-021-03184-8
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svelte.dev svelte.dev
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github.com github.com
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stackoverflow.com stackoverflow.com
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Explicitly defining the dependency in the reactive declarations
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inputValue = updateInputValue(value);
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github.com github.com
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github.com github.com
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github.com github.com
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We should instead invalidate the ultimate dependencies of filtered rather than filtered itself:
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github.com github.com
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Svelte currently consistently gives the reactive statement priority over your checked binding.
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github.com github.com
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github.com github.com
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maybe this just comes down to general footguns with reactivity, and being aware of them as a developer.
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- Nov 2021
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stackoverflow.com stackoverflow.com
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Stores are the idiomatic Svelte way when you need to import "reactivity" from your normal JS sources.
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stackoverflow.com stackoverflow.com
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if you put the reactive statement $: validate(inputValue); after the function updateInputValue declaration, it's working as expected:
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- Oct 2021
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www.kylehq.com www.kylehq.com
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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. But as you start to rely more on UI updates based on variable or array/object changes, it’s likely that your UI will start skipping a beat and dropping values that you know explicitly to be there.
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stackoverflow.com stackoverflow.com
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Personally I think option 1 is the way to go as it doesn't allocate any memory to create a new array but rather modifies the existing array. Then the assignment just lets the compiler know that you modified the array.
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- Sep 2021
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psyarxiv.com psyarxiv.com
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DuPont, C. M., Pressman, S., Reed, R. G., Marsland, A., Manuck, S. N., & Gianaros, P. J. (2021). An Online Trier Social Stress Paradigm to Evoke Affective and Cardiovascular Responses [Preprint]. PsyArXiv. https://doi.org/10.31234/osf.io/fcyqd
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- Feb 2021
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psyarxiv.com psyarxiv.com
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Safra, L., Chevallier, C., & Sijilmassi, A. (2021). Poverty and Threat Reactivity. PsyArXiv. https://doi.org/10.31234/osf.io/fp35r
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- Jan 2021
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github.com github.com
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Or just watch the value with a reactive statement instead of an event handler on the input like: $: inputValue, onInput() This is a good solution and seems to work in all cases.
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github.com github.com
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What I think is happening is that instantiating the component is immediately running the $: reactive code, which dispatches the event synchronously, before the parent component attaches the listener.
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- Nov 2020
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codeburst.io codeburst.io
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A great thing about CSS variables is their reactive nature. As soon as we update them, whatever property has the value of the CSS variable gets updated as well.
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timdeschryver.dev timdeschryver.dev
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For me, this makes Svelte the most reactive "framework" at the moment
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- Oct 2020
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svelte.dev svelte.dev
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svelte.dev svelte.dev
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svelte.dev svelte.dev
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My version of https://svelte.dev/repl/9c7d12357a15457bb914705702f156d1?version=3.19.2 from https://github.com/sveltejs/svelte/issues/4586
to try to simplify and help me understand it better.
So the lack of synchronousness is only noticed inside handleClick.
By the time the DOM gets updated, it has a consistent/correct state.
In other words, the console.log shows wrong value, but template shows correct value. So this might not be an actual problem for many/most use cases.
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svelte.dev svelte.dev
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github.com github.com
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github.com github.com
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I too have been confused by behavior like this. Perhaps a clearly defined way to isolate atomic units with synchronous reactivity would help those of us still working through the idiosyncrasies of reactivity.
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For performance reasons, $: reactive blocks are batched up and run in the next microtask. This is the expected behavior. This is one of the things that we should talk about when we figure out how and where we want to have a section in the docs that goes into more details about reactivity. If you want something that updates synchronously and depends on another value, you can use a derived store:
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github.com github.com
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even though f() reads the reactive variable count in its body, because the variable count isn't present in the reactive statement itself, the statement is not seen as having a dependency on count.
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github.com github.com
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I expected that the param being passed by reference to have the same reactivity of the variable being created in the script tag.
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There's an issue #3368 for describing better what triggers reactive updates, as I do think there is some stuff we could be more explicit about
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vuejs.org vuejs.org
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These are good docs.
Referenced by: https://github.com/sveltejs/svelte/issues/3368#issuecomment-519289238
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github.com github.com
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This isn't a bug. Svelte's reactivity is triggered by assignment, so it won't re-render on mutations like array pushing.
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this is a common Svelte idiom for manually invalidating something that might have been mutated without there being a visible = sign somewhere
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www.hackingwithswift.com www.hackingwithswift.com
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Imperative UI causes all sorts of problems, most of which revolve around state, which is another fancy term meaning “values we store in our code”. We need to track what state our code is in, and make sure our user interface correctly reflects that state.
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svelte.dev svelte.dev
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whenValueChanges whenValueBecomes
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github.com github.com
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Store is reactive because it should re-evaluate when track is changed.
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levelup.gitconnected.com levelup.gitconnected.com
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Since Solid uses fine grained updates and Components are only rendered in their entirety once, you can wrap over state simply by using closures.
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It is built using brutally efficient fine-grained reactivity(No Virtual DOM)
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I kept on wanting them to work like Fine-Grained reactivity, since it was much more intuitive.
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The $: can also be used to trigger effects.
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Any variable referenced on the lines marked with $: is marked as a dependency of the derived variable.
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We can run effects when some data changes using watchEffect - it takes a function that runs whenever a reactive value used inside changes.
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There's one downside to Reacts reactivity model - the hooks (useState and useEffect) have to always be called in the same order and you can't put them inside an if block.
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It's possible to run a function whenever some reactive state changes using the useEffect hook. In the example we log the length of the todoList whenever it changes. The first argument to useEffect is the function we want to run, and the second is a list of reactive values to track - whenever one of these values changes the effect will run again.
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So how do we declare the variable y to be the value of x plus 5? That's where reactive programming comes in. Reactive programming is a way of programming that makes it possible solve this problem
Tags
- reactive programming
- confusing for newcomers
- simple explanation
- good explanation
- Svelte: reactivity
- react hooks
- reactivity
- order is important / do things in the right order
- React
- useEffect
- Vue
- equivalent/analogous/alternative ways to do something between 2 libraries/languages/etc.
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Do these blocks allow for reactive assignments? @lukeed They're read-only, but values update when their dependencies do
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$: for watching dependencies in expressions, a much more concise useEffect, if React is familiar.
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- Sep 2020
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www.javascriptjanuary.com www.javascriptjanuary.com
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As you can see, it uses Javascript label syntax to tell the compiler where recalculation should be carefully managed. And you thought that no one uses labels any more.
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You know those useMemo and useCallback hooks? Well, Svelte has something like this. If you declare a variable like this: $: double = counter * 2;, Svelte will recalculate it only if counter changes.
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svelte.dev svelte.dev
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for example, reactive declarations essentially do the work of React's useMemo, useCallback and useEffect without the boilerplate (or indeed the garbage collection overhead of creating inline functions and arrays on each state change).
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github.com github.com
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Since one of Svelte's main principles is reacting only to data changes (as opposed to re-render the whole app with the full state all the time)
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github.com github.com
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Using a reactive statement is a good way to explicitly turn a reactive variable into a store
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Non-store reactivity needs to be analyzable at compile time.
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daveceddia.com daveceddia.com
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Svelte only runs the <script> code once.
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blog.carbonfive.com blog.carbonfive.com
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$: declares a relationship, where remaining should always be 10 - count. This might seem weird, but it’s conceptually the same as declaring a variable that you know will be re-calculated in every React render loop — except that remaining will get recalculated only when count changes.
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Since you often want to do calculations based on state, Svelte also has the “reactive declaration” symbol, $:. It’s like a let declaration, but whenever any variable referenced in the expression — count in this case — is updated, the expression is re-run, the new variable’s value is updated, and the component is re-rendered.
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The heart of Svelte’s magic is “reactivity”. Every let declaration sets up a listener, where any time the variable is assigned to, the change triggers a render of the component. So when the increment function calls count++, the component will re-render, which will update the value shown to the user by Count: {count}.
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svelte.dev svelte.dev
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Reactive statements run immediately before the component updates, whenever the values that they depend on have changed.
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svelte.dev svelte.dev
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You're not limited to using $count inside the markup, either — you can use it anywhere in the <script> as well, such as in event handlers or reactive declarations.
Don't forget to make the statement reactive. Referencing $count is not enough to get it to be re-run on update!!
Example:
$: console.log(`the count is ${$count}`);
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- Aug 2020
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science.sciencemag.org science.sciencemag.org
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Mateus, J., Grifoni, A., Tarke, A., Sidney, J., Ramirez, S. I., Dan, J. M., Burger, Z. C., Rawlings, S. A., Smith, D. M., Phillips, E., Mallal, S., Lammers, M., Rubiro, P., Quiambao, L., Sutherland, A., Yu, E. D., Antunes, R. da S., Greenbaum, J., Frazier, A., … Weiskopf, D. (2020). Selective and cross-reactive SARS-CoV-2 T cell epitopes in unexposed humans. Science. https://doi.org/10.1126/science.abd3871
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