Dating profiles, Generated Media says, are a prime example. If you’re creating an online dating profile, you can grab a

A race condition occurs when two or more operations must execute in the correct order, but the program has not been written so that this order is guaranteed to be maintained.

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determine that shortly after the police sketch from the rape victim began circulating, Chandler moved from Tampa. He also sold his blue and white boat. When police interviewed the buyer of that boat, he stated that he remembered seeing a stack of cinder blocks at Chandler’s home. At the time of the Rogers’ murders, he had also worked as an aluminum building contractor.

Most of the time, this shows up in what’s called a data race, where one concurrent operation attempts to read a variable while at some undetermined time another concurrent operation is attempting to write to the same variable.

Concurrent code is notoriously difficult to get right. It usually takes a few iterations to get it working as expected, and even then it’s not uncommon for bugs to exist in code for years before some change in timing (heavier disk utilization, more users logged into the system, etc.) causes a previously undiscovered bug to rear its head. Indeed, for this very book, I’ve gotten as many eyes as possible on the code to try and mitigate this.

I’m not saying that you should never use hooks; in fact, I use React hooks all the time! But in certain cases, class components make your code more readable and maintainable.

One anti-pattern I have seen a lot is what I call over-reliance on conditional rendering. For example, it is incredibly easy to hide a component in 2 lines of JS in React:

If you are like me, Example 1 is something I can glance at and immediately understand what it does. However, in Example 2, I had to reference the docs and a couple of blog posts to remember what useCallback does.

Overall, I’d encourage all React developers to learn about all of the powerful features that the Web Platform has to offer. Oftentimes, they will make your components simpler, more maintainable, and more robust. Your team (and your customers) will thank you! ❤️

If you are not aware, hooks are the new hotness in React. They are incredibly useful for handling state in functional components and oftentimes make React code simpler, and easier to read.

Editor’s Note: Concurrency is one of the hardest concepts for many developers to grasp, but it is an important concept to grasp in modern software development. In this excerpt from the first chapter of her book Concurrency in Go, Katherine Cox-Buday discusses one of the most common issues with concurrent programming: race conditions.

Fortunately everyone runs into the same issues when working with concurrent code. Because of this, computer scientists have been able to label the common issues, which allows us to discuss how they arise, why, and how to solve them.

Overall, I’d encourage all React developers to learn about all of the powerful features that the Web Platform has to offer. Oftentimes, they will make your components simpler, more maintainable, and more robust. Your team (and your customers) will thank you! ❤️

2 go func() { // In Go, you can use the go keyword to run a // function concurrently. Doing so creates // what’s called a goroutine. 3 data

However, this can often lead to jarring user experiences since components pop in and out of existence instantly. Instead, I prefer to use conditional classnames and CSS to create a smoother UX.

Here, lines 3 and 5 are both trying to access the variable data, but there is no guarantee what order this might happen in. There are three possible outcomes to running this code: