Michel Weststrate (threads.net@weststratemichel) @mweststrate Twitter profile

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Michel Weststrate (threads.net@weststratemichel)

8 years

Egghead.io MobX course is now online! "Manage Complex State in @reactjs Apps with #MobX " @eggheadio

Manage Complex State in React Apps with MobX

MobX is designed to enable building web applications with a complex data model in an intuitive and very performant manner. Using React and MobX is curre...

egghead.io

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

1 year

Bye bye stack overflow.

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

I figured I'm tired of seeing const vs let vs var, so from now on I won't use any of those. I call it "functional programming"

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

5 years

Packing for our move to London😯 ...'cause I will join @fb_engineering in little over a month! So many people I'm looking forward to be working with 🤩. And so much potential impact to be made!

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

2 years

Copilot, but the inverse: I get to write the code, the tool writes the docs...😍

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

2 years

#TIL sorting JavaScript numbers doesn't do what I think it does. I might have introduced some bugs over the course of my career as a result 😅

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

5 years

2016: #MobX uses side effects during reads to automatically re-render on changes. Impure! Blasphemy! Untestable! 2019: #React suspense uses side effects during reads to automatically re-render on changes! This is the best thing since sliced bread! #eventualconsistency

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

I think the JavaScript feature with the biggest unlocked potential are (async) generators. They are perfect for long running processes / conversations. Here a fun example of their potential: stateful, functional components without using hooks in React:

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

#MobX or @recoiljs ? Saw a lot of questions on whether they're the same, so a quick thread. First of all, Recoil & MobX solve the same problem: efficient render widely shared state. This is a problem React (Context), Redux and most state management libs don't solve.

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

6 years

Woke up last night with the idea that copy-on-write (with structural sharing) would make writing #Redux reducers much more straightforward. So, here it is (before and after). Happy new year!

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

Unpopular opinion between typescript and prettier, there is very little justification for eslint

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

6 years

✨ MobX 4 has been released! ✨ - decorate without decorator syntax (CRA!) - first class support for dynamic, observable data sources - flows & async when - extend observable objects dynamically - API simplifications - faster, smaller #mobx #reactjs

MobX 4: Better, simpler, faster, smaller

..and still, MobX 5 will be even more awesome 😺

medium.com

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

7 years

Dear #javascript community. Please stop turning down articles for mistakes in grammar. Not everybody is a native English speaker

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

... it's literally used in Battlefield 🤷‍♂️

Martin Jee

@MartinJee

4 years

Mobx is a "battle tested" library. Riiiiiight.

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

6 years

Ok, @reactjs hooks are really killing it. Re-implemented the mobx-react bindings in 16 LOC with hooks: #ReactConf2018 . So. Much. Cleaner. Can hardly express how much messy stuff this fixes... 👏👏🏅🏅👌👌💸💸🧙‍🧙‍

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

Just wondering how many years of software engineering it takes, until you are not disappointed with yourself anymore, when you spend a whole day of fixing build stuff, and then end up with a 5 line diff🤔

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

Just released #mobx 6! 👉 makeAutoObservable 😍 👉 Decorator free by default 👉 Fully revamped docs for modern React 👉 Supersedes both MobX 4 and 5 👉 Codemod for migration

Announcing MobX 6

Homepage of Michel Weststrate

michel.codes

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

3 years

Just released Immer 9.0, which ships a lot of TypeScript improvements. The coolest change is that it now can infer the type of a draft if a curried producer is passed to, for example, a React state updater. Changelog: Docs:

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

Finally organized a desk to #wfh . The view is definitely a perk. #london

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

5 years

Here is a fun thought experiment: Can we adopt hooks like a general programming paradigm. As a way to organize code, not necessarily related to UI? Did a quick re-implement of hooks without React, & applied to raw HTML. The model holds up nicely! 😗

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

6 months

New Blog: #MobX now supports standard decorators! 👉 Clean (no constructor code) 👉 30% less overhead 👉 Works out of the box in TypeScript 👉 Some cool news around MobX & signals!

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

6 years

Remember, console.log processes it's arguments async (lazily), so always pass it immutable data to avoid surprises! #javascript

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

It might be just me, but often using a switch statement instead of if..else nesting helps me to clean up logic. Instead of creating a nested decision tree it forces to order decisions based on logical priorities which is self documenting.

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

2 years

I'm unreasonably excited about the introduction of error.cause and in #JavaScript

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

5 years

Today is our 10th anniversary!

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

5 years

Reminder: the primary goal of a function is not to enable reuse. The goal is to create a great narrative. Telling a big picture solution, and hiding nitty gritty details If your primary trigger for creating functions is reuse, code base might not be in the most readable shape

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

6 years

You won't understand OSS until you understand that an OSS project is not the responsibility of it's maintainers, but the shared responsibility of all it's consumers.

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

Updating immutable objects Immer-style might become a first class language construct for records / tuples 😍

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

Sneak preview of what MobX 6 without decorators will look like … (decorators can still be used, but opt-in rather than opt-out)

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

5 years

🎉Released a funny #React ⚛ hook package: use-st8. A single function useState hook alternative that removes the need for array destructurings😇.

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

6 years

👸👸👸 Proxy powered #MobX 5 has been released! Release announcement:

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

3 years

Started to teach the girls programming. Super fun so far. Funny enough switched after 2 days from React to @sveltejs (never used it), to reduce the amount of ceremony 😅

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

🎉Just released #Immer 5.2.0! 👉Addressed all known issues with Map and Set! Recommend to update if you use those 👉Significant bundle size reduction (6KB now in total). 👉Partial core rewrite, to reduce mem footprint and improve perf 💋Next version: TypeScript improvements

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

8 months

The world converges to 2015's #MobX reactivity system in the end😇

Rich Harris

@Rich_Harris

8 months

Lots of folks have noticed superficial similarities between Svelte's runes and Vue. There definitely are some ways in which we're moving closer to other frameworks — not a bad thing! But in other ways our designs remain quite different

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

50% of the performance improvements I make is simply making code evaluating lazily. Being able put "() =>" in front of an arbitrary block of code is such a great and underused feature of JavaScript

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

Just released Immer 7! 👉 `current` utility to create snapshot of a draft in the middle of a produce! (great for debugging as well) 👉 Support for getters / setters (should help with MobX, Vue etc) 👉 many small fixes and improvements

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

TL;DR Too long, didn't review

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

5 years

Since y'all eagerly awaiting hooks anyway, here is a new blog as distraction: "UI as an afterthought" Or: how will React context and hooks change the game of state management? #reactjs #MobX

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

5 years

For those wondering what I am working on currently @facebook : I joined the team that maintains the Flipper mobile debugging studio: It's pretty cool, and gonna be even better! Such as having first class React Native support.

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

3 years

🤵👰 12 years!

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

2 years

Frontend tip: I quite regularly spot CSS bugs during development by having Scrollbars set to "Always" on my Mac, as it'll show scrollbars on place where I didn't intend them to. (Q: Is there a dev tools tick to achieve the same?)

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

Since l've started to use @typescript 's typeof, Type['subType'] and ReturnType<> abundantly, I feel like the amount of type annotations I write is halved. Greatly improves refactoring speed as well.

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

Software Architecture in theory: 👌 Let's subscribe to this beautiful system notification Software Architecture in practice: 🤷‍♂️ Let's poll this port and run that command every 2 seconds, and wrap it in an event style API

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

5 years

I created fresh @eggheadio course about #immer this summer, and it is now publicly available! It's packed with small tips and tricks and cool applications of some unknown features. So check it out 😊

egghead.io

@eggheadio

5 years

Immutable JavaScript Data Structures with Immer - #javascript course by @mweststrate

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

wait, isn't the second argument supposed to be 'null' so that you can put '2' as the mandatory third argument 🤔. That argument has actual meaning 🤯

Tejas Kumar

@TejasKumar_

4 years

🚀 In case you haven’t used it yet, the second argument of JSON.stringify lets you cherry-pick 🍒 keys to serialize. 😄

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

5 years

Honestly, first day at @fb_engineering about mission, values, principles was honestly better & deeper than I'd hoped for 😊

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

5 years

* 31 Aug - issue gets filed * Okt - multiple duplicates. Many +1's * Nov: most of them closed; no reproduction * 3 Dec, someone create a trivial, 20 LOC reproduction * Few hours later, fix released --- Providing a simple reproduction increases chances of a resolution 100-fold

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

6 years

🧙‍♂🦄Released #immer 1.5.0🧙‍♂🦄 Immer can now record the minimal incremental updates to go from one state to the next and replay, undo, or log those changes! This also makes concurrent state updates possible It's like git patch / revert / rebase for immutable trees

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

Using immutable data structures are an unnatural fit for things that are supposed to change over time

Tomasz Łakomy

@tlakomy

4 years

Which tech opinion you got that results in this

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

It took like, eeh.... 2 years or something🙄, and still needs loads of polishing (PRs welcome), but finally MobX-State-Tree now has an official website which should be much easier to navigate around than that mega readme!🎉 👉

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

My youngest had some troubles learning her number bonds, so I figured to hack something together on @codesandbox . 2 hours of work, hosted, no deploy process, works on mobile, installable as app. What a time to be alive 😍 /

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

5 years

Just released #immer 2.0.0. It now supports async producers! Thanks @alecdotbiz for the PR!

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

I totally missed it, but it seems Immer overtook ImmutableJS somewhere end Q1 as most downloaded JS immutability library. Rad.

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

I love useMemo, and the memoized functions are in principle easy to testable since deps are known But in practice they aren't as they close over their deps, preventing hoisting. So I now use a small `useMemoize` utility that encourages me to write them in a testable manner.

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

6 years

Published my first custom React hook: `use-immer` to use local, immer based state updates. . Demo: @reactjs #ReactConf2018 . I'm ehh.... hooked 😏

useImmer - CodeSandbox

useImmer by mweststrate using immer, react, react-dom, react-scripts, use-immer

codesandbox.io

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

#mobx 6 is gonna be flipping good.

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

6 years

Released #immer 1.2. It is now possible to pass an initial state to a curried producer!

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

Still my best work so far: 👉 absolute pun name 👉 saves characters 👉 no actual new functionality to learn (or offer) 👉 source fits in a tweet but reads like a detective 👉 solves a theoretical perf problem

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

9 months

👊 years later MobX still makes people go home early by keeping complicated projects scalable and fast 🤌the trias politicas of observable > derived > effect has become so much the de-facto mental model, that it has become the standard way of doing reactivity/signals

kitze 🚀

@thekitze

10 months

this is what the mobx-state-tree global store looks like for @sizzyapp . it's composed out of all of these files in the video. after 4 years of adding new features and growing the store, the app is still performant and you can use *any* property from the store in *any* component…

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

6 years

Celebrating 9 years. The #redux to my #mobx . Independence day has a different meaning for us 😁.

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

Few weeks into Redux, and my favorite / most used devtool after using the official ones a few times is: if (!isProduction()) { = store } at the end of index.tsx. Coincidentally also my favorite devtool for MobX 🤔

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

6 years

Today I applied new name & folder conventions to our entire 300KLOC code base. Moved, renamed & splitted dozens classes. Touched 140 files, hundreds of import statements. Only one unit test, no e2e failed entire day. How? Static type checking. Indispensable in large code bases

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

5 years

I've been working on an external project lately where *all* components are stateless. Even the view only state is captured in MST models. It has a benefit I never realized before; all component tests become non interactive snapshot tests. Should maybe blog about it.

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

6 years

That #mobx is being downloaded more than @preactjs or @apollographql is well beyond any of my expectations. Makes me feel I should investigate it's full potential more and maintain it more actively.

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

5 years

So here is some exciting news! This week is my last week @mendix . Funny enough, I'm not sure yet what my next steps will be 🙃, but quitting allows my family & me to (hopefully) proceed with life in a lower, more flexible gear, making easier to orient on the longer term future

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

6 years

Hanging out with the best two side effects ever.

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

#javascript debuggingtip: You don't need to modify source files to add console.logs. Use conditional breakpoints instead 🤩

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

3 years

My team is onto me

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

I can shamelessly recommend opposing solutions. Funny position to be in🤓 #mobx #immer

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

5 years

"Reusable time travel with React hooks and immer" by @swyx . Pretty nifty 😊

Reusable Time Travel with React Hooks and Immer

Learn how and why to make a useTimeTravel React hook that we can use to make Tolerant User Interfaces.

frontarm.com

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

3 years

Many reactive libraries still stop just before the place where it get's hard: handling objects and arrays intuitively & first class. Don't just check counter demos, but more complicated referential state: objects, arrays, maps, refs. #mobx

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

3 years

And 1.9 billion of them are dependabot PRs on repos I maintain 🥶

Nat Friedman

@natfriedman

3 years

GitHub processes 2.8 billion API requests per day, peaking at 55k rps. Lots of busy bots. 🤖

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

6 years

The #mobxstatetree course @eggheadio is now available! . Check it out to see how mobx-state-tree covers all common state management patterns!

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

6 years

Carefully use the word "bug" A bug is something not working to its specification. Something not working as you intended is an issue, but not a bug. Until you proof it is not according to spec. Until then don't say: "There is a bug", but: "I have an issue"😎

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

5 years

Super happy that #immer won the OS breakthrough of the year award at @ReactAmsterdam ! Never stop experimenting! Some day you might stumble upon something really powerful 😊

React Summit 💥 Amsterdam/New York & Online

@ReactSummit

5 years

🏆 Immer by @mweststrate

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

5 years

Bumping #mobx -react React version from 0.13 to 16.8. #React catched up in so many ways! - hooks made implementation significantly simpler - no more patching of life-cycle methods needed - Provider/inject -> minimal wrappers around createContext - No need anymore for own devtools

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

6 years

Did you know that #immer does not just simplify reducers, but can greatly simplify React.setState calls as well? @reactjs #reactjs

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

2 years

First time in my life I took the effort to write my representative in parliament: Support #Ukraine in whatever way possible, incl immediate NATO membership. I don't belief this evil will stop anywhere until checked by counterforce. Thoughts with those in another horrific night🇺🇦

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

3 years

Team building 101: don't use the word "I": "We built this awesome feature". "We messed something up". Unless of course *you* messed something up; then it's still "I".

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

Zero idea how other companies fare, but to me feels @fb_engineering 's internal handling of Corona is exemplary. Zero panic, freedom to act on own consciousness, guidelines to minimize physical interactions from very early on. + lots of wfh infra improvement cranked out last week

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

6 years

Myth busted: Amazon, Microsoft, IBM, SAP, Lyft, Coinbase, Wix, EA/Dice, Infinum, Formidable, DAZN, cypress, jenkins all use #mobx (and feel free to add your company to the list😎)

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

6 years

Neat new feature is coming in #mobx 4: Decorate without decorator syntax!

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

6 years

Sometimes people wonder why I love to work remote. I have no clue.

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

#immer 6.0.0 has been released! 👉Features not needed by everyone have been made opt in, reducing the minimal size from 6.1 to 3.1 kb gzipped 👉Some performance optimizations on large data sets 👉Added compatibility for TS < 3.7

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

6 years

Had an idea for a new state management library. Simple, small, fast. And so far it works amazing. Shit.😞 #cannotunsee #ideaoverflowexception

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

5 years

And they're ready for first school day😍. Honestly this is by far the scariest part of migrating: new school, friends, language for the kids😅

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

6 years

Close. Your. Issues. Consuming #OSS is not like going to a restaurant. It is like visiting your mom. If you got a meal, help with the dishes. The *least* decent thing you could do is to at least closing the issue after it has been answered. Maintainers aint waiters (or moms)

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

5 years

Just released #immer 5.0, with a long awaited feature: First class support for Map✅and Set ✅🤩! Big shoutout to @AndreyBoldyrev4 (?) @ai_goncharov and @alecdotbiz for making it happen!👏👏👏 P.S. Fan? 👉

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

1 year

It's really cool to see fine grained reactivity becoming state of the art in frontend. Couldn't muster the energy to push for it after MST, but @solid_js does it far better than I'd have managed. The unexplored future is signals that produce mutations.

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

6 years

Over a decade ago I was the 1st paid hire of this company (as part time student job). It was on a mission nobody held possible (including me; so I refused payment in shares; students need cash😅). Now the vision has proved 700m$ worth. Proud. #mendix

Siemens to Acquire Mendix

In 2018, Siemens AG acquired Mendix for €0.6B ($730M) plus a significant multi-year investment to accelerate R&D innovation and the global footprint of our platform.

www.mendix.com

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

5 years

Just realising I can spend the entire day browsing Facebook, and people will assume I am just testing very thoroughly😇

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

5 years

one of the biggest wins of @Docker is how easy it becomes to test random new tech. Just docker run <some cool new database> without the mess of figuring out build tooling dependencies, freeing up ports etc. after that, docker-compose for a reproducible env setup is just 😍

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

6 years

New blog post! Immer: Immutability for #javascript the easy way. Also, there is an @eggheadio video now explaining Immer.

Simplify Creating Immutable Data Trees With Immer

Immer is a tiny library that makes it possible to work with immutable data in JavaScript in a much more straight-forward way by operating on a temporari...

egghead.io

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

I want to joke about MobX. But I fear there wouldn't be any reaction.

ankeet maini

@ankeetmaini

4 years

I've a joke on CSS-in-JS but it lacks sass.

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

5 years

#Immer now has a website! No more endless scrolling on the Readme :)

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

5 years

#MobX is downloaded 1 million times a month. At some moment in time that number will sink in. But it didn't happen yet. Maybe, when I'm retired, staring at my fire place. 🤷‍♂️

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

6 years

How to make speaking scary 101: use a theatre 😂

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

4 years

Every JavaScript value should be iterable. Fight me.

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Michel Weststrate (threads.net@weststratemichel)

@mweststrate

5 years

mobx-react @6 beta is now available! 👉 yarn add mobx-react @6 .0.0-rc.2 👉 adds support for hooks, and includes all hooks from 👉 Changelog: 👉 Sandbox: 👉 7 -> 4 KB

mobx-react 6 - CodeSandbox

mobx-react 6 by mweststrate using mobx, mobx-react, react, react-dom, react-scripts

codesandbox.io

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