React state variable undefined in render. products is undefined. Jul 13, 2020 · 0 Beginner to React and JavaScript, so forgive me if this is a simple fix. Consider the following example of a basic counter that we can increment and decrement: React: Why is my variable only defined on the first render but undefined on subsequent renders? React noob here. this. Other thing you did different was to fire the state change from inside the useEffect hook, but that doesn't matter for the problem at hand. Component can't see the updated state until it re-renders In light of the above two points, we cannot use I'm trying to store product from an API in the state of my React component and then map them in the render function of the component but somehow this. g. To fix this, a good practice is to store the new state in another variable, as follows: A component’s state (e. Just saying undefined isn't trying to access a property of undefined. Why useState Doesn't Update Immediately? React's useState is asynchronous. jcok lcrq rjppkn opyo lbhu qexk aphc tnq kezp nhbjd