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Show HN: MobX-Style Observables in Svelte
- gedy 6y agoI love Mobx with React and also Svelte, but Svelte already has reactive and derived values? https://svelte.dev/tutorial/reactive-statements https://svelte.dev/tutorial/reactive-statements Not clear what this solves or improves upon.
- kewp 6y agoReactivity, yes - works the same as MobX's autorun. But not derived values. You can ensure something gets updated by wrapping it in $: ``` $: value = $x + 2 ``` but you can do that somewhere else as well ``` $: { let y = 20 $value += y } ``` Makes it insanely hard to track where changes come from. You can't say "this value is _only_ updated by these changes". You can do this with derived stores, though. But each store must be it's own, separate value - with MobX's observable you have a central object representing your entire state, each of which is made automatically reactive, and putting in a derived store is just prepending with -get-. It's much cleaner.
- pier25 6y agoWhat's the point of this when Svelte already provides reactive primitives?
- kewp 6y agoHey. See my answer to the same question below.