4/27/2023 0 Comments Check memo![]() Where we used mo to optimize a graph component, we can’t use useMemo for the same purpose. Similar in the sense that it also memoizes values but different because useMemo is a hook and as a result is limited in how it can be used. UseMemo is one of the built-in hooks in React and it performs a fundamentally similar but different job to mo. However, If you do not have any values in the callback that could change over the course of time, then ignoring it in the equality check function would be fine. In our case, if subscribedListeners changes and you ignore the onRenderFinish prop in the equality check function, you’ll effectively be showing notifications to an outdated list of subscribers. But there are cases where it is actually important to compare a callback function prop. You could also decide not to compare the callback function in the custom equality check function since you can decide which props trigger a re-render. This could also be an expensive operation depending on the size of the function but in most cases, should work fine. If I had an unoptimized function that calculated the digits of PI, it would consume a lot of CPU resources every time I called this function. This is exactly how memoization works in programming as well. In essence, you memoized (memorized) the result of 99 * 22 the first time you calculated it and every time someone asks you what the answer is, you no longer have to calculate it again. However, if at a later stage you were asked the same question of 99 * 22, you already know the result from the last time you answered it and you can answer the question immediately without having to do the calculations all over again. The first time you hear the question, it might take you some seconds to perform the calculations and you arrive at the answer 2,178. Say you were taking a Mathematics quiz and you were asked the products of 99 and 22. “In computing, memoization or memoisation is an optimization technique used primarily to speed up computer programs by storing the results of expensive function calls and returning the cached result when the same inputs occur again.” Memoization is a fancy computer science buzzword that just means a way to avoid doing unnecessary work. I also have filed 2020 Tax report and it was accepted March 17, 2021. I filed 2019 tax return timely and already got a refund direct deposit to our bank account sometime around 2020s normal timeframe. When this happens, there are some React APIs that we can reach for to improve performance and today, we’ll focus on two of the most misunderstood ones - mo and useMemo.īefore we do this, however, it’s important to get a clear understanding of the concept of memoization and how it relates to these two APIs. In the memo field area is typed, in capital letters, 'FLET FRESNO 12/2019 TAX REFUND 30 INT 29.51'. There are certain cases where rendering a component might be so expensive that it uses up a lot of CPU resources and/or memory (i.e rendering a graph with thousands of data points). As a React developer, you’ve most likely come across situations where optimizing the performance of a component is necessary.
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