amp setstate on page load

All three are async. It should not be directly mutated. Planned Economy Bakery - Trying to scale a nested loop with a heap. setState() will always lead to a re-render unless shouldComponentUpdate() returns false. You can't say for sure that the three lines in updateAge would work in that order. If you find yourself having to write setState within render, you may want to rethink the design. Apparently, today, I could call setCounter(value, callback) so that some task is executed after state is updated, avoiding a useEffect. Version Control For Salesforce — Branching Strategy, 30 year Groundhog's day: Surviving High School with sanity intact (ie how to avoid the repetativness of school life). This example is too simle to see this. The true is that setState callbacks its one of the hardest problems while migrating on hooks from classes which hasn't one clear solving method. This section is inspired by the below tweet from Dan Abramov. setCounter is async you don't know if console.log will be called after setCounter or before. Embracing the restrictions of AMP (ie. To avoid unnecessary renders, calling setState() only when the new state differs from the previous state makes sense and can avoid calling setState() in an infinite loop within certain lifecycle methods like componentDidUpdate.

If you want the setState callback to be executed with the hooks then use flag variable and give IF ELSE OR IF block inside useEffect so that when that conditions are satisfied then only that code block execute. Couple weeks before the day of the hackathon, we started sketching ideas, mapping out entry points, exploring potential landing pages and markets, reviewing traffic data on GA, comparing conversion opportunities, and discussing obstacles and constraints. site design / logo © 2020 Stack Exchange Inc; user contributions licensed under cc by-sa. Therefore the implementation can be done in the following way: We can use the user hook here to identify the first render.

How to scribe a circle in the ground...without access to the middle point?

Or watch it here: An introduction to setState In fact, this may be a perfect use-case to implement the state machines pattern. What does The Doctor mean by "Hello" in "The beast below"? You answer is wrong, and in shouldn't be marked as correct to not confusing newbies. Sometimes you really wil be enougth some value-depending effect, and sometimes it'll requires some hacky methods, like saving some kind of flags in Refs. So if you need to use this in Javascript, just remove some type notation from code. P.S. @Zhao, you did not mark the correct answer yet. We planned on A/B testing our AMP page with our current production version for 30 days to see if our speed improvements had any impact on user engagement. Unfortunately, it is not working in hook. Instead, changes should be represented by building a new object based on the input from prevState and props. In the above usage example, console.log(state) will print 1 not 2. useEffect, that only fires on state updates: Above will mimic the setState callback best and not fire for initial state.

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