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<h1 class="section-title section-title--orange-underline">
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What is Rust and why is it so popular? </h1>
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<span class="posted-on-container posted-on-container--avatar"><span class="avatar" itemprop="avatar"><a class="avatar__url url fn n" href="https://stackoverflow.blog/authors/jgoulding/"><img class="avatar__image" src="https://secure.gravatar.com/avatar/f87a220e9c58c1cacfd615ad9d9d9f4f?s=96&d=mm&r=g" /></a></span><span class="author vcard" itemprop="author"><a class="url fn n" href="https://stackoverflow.blog/authors/jgoulding/"></a><span class="author-name">by <a class="url fn n" href="https://stackoverflow.blog/authors/jgoulding/">Jake Goulding</a></span></span><span class="date"> on <time class="entry-date published updated" datetime="2020-01-20T07:39:00-05:00">January 20, 2020</time></span></span> </div>
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<p>Rust has been <a href="https://insights.stackoverflow.com/survey/2019">Stack Overflow’s most loved language for four years in a row</a>, indicating that many of those who have had the opportunity to use Rust have fallen in love with it. However, the roughly 97% of survey respondents who haven’t used Rust may wonder, “What’s the deal with Rust?”</p>
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<p>The short answer is that Rust solves pain points present in many other languages, providing a solid step forward with a limited number of downsides.</p>
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<p>I’ll show a sample of what Rust offers to users of other programming languages and what the current ecosystem looks like. It’s not all roses in Rust-land, so I talk about the downsides, too. </p>
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<h2>Coming from dynamically-typed languages</h2>
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<p>The arguments between programmers who prefer dynamic versus static type systems are likely to endure for decades more, but it’s hard to argue about the benefits of static types. You only need to look at the rise of languages like TypeScript or features like Python’s type hints as people have become frustrated with the current state of dynamic typing in today’s larger codebases. Statically-typed languages allow for compiler-checked constraints on the data and its behavior, alleviating cognitive overhead and misunderstandings.</p>
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<p>This isn’t to say that all static type systems are equivalent. Many statically-typed languages have a large asterisk next to them: they allow for the concept of <code>NULL</code>. This means any value may be what it says <strong>or nothing</strong>, effectively <a href="https://franklinchen.com/blog/2012/09/06/my-pittsburgh-ruby-talk-nil/">creating a second possible type for every type</a>. Like Haskell and some other modern programming languages, Rust encodes this possibility using an <em>optional type</em>, and the compiler requires you to handle the <code>None</code> case. This prevents occurrences of the dreaded <code>TypeError: Cannot read property 'foo' of null</code> runtime error (or language equivalent), instead promoting it to a compile time error you can resolve before a user ever sees it. Here’s an example of a function to greet someone whether or not we know their name; if we had forgotten the <code>None</code> case in the <code>match</code> or tried to use <code>name</code> as if it was an always-present <code>String</code> value, the compiler would complain.</p>
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<figure class="wp-block-image size-large"><img src="https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.07.59-1200x148.png" alt="" class="wp-image-14768" srcset="https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.07.59-1200x148.png 1200w , https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.07.59-300x37.png 300w , https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.07.59-768x95.png 768w , https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.07.59-1536x190.png 1536w , https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.07.59-400x49.png 400w , https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.07.59.png 1956w " sizes="(max-width: 1200px) 100vw, 1200px" /></figure>
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<p>Rust’s static typing does its best to get out of the programmer’s way while encouraging long-term maintainability. Some statically-typed languages place a large burden on the programmer, requiring them to repeat the type of a variable multiple times, which hinders readability and refactoring. Other statically-typed languages allow whole-program type inference. While convenient during initial development, this reduces the ability of the compiler to provide useful error information when types no longer match. Rust learns from both of these styles and requires top-level items like function arguments and constants to have explicit types, while allowing type inference inside of function bodies. In this example, the Rust compiler can infer the type of <code>twice</code>, <code>2</code>, and <code>1</code> because the <code>val</code> parameter and the return type are declared as 32-bit signed integers.</p>
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<figure class="wp-block-image size-large"><img src="https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.12.45-1200x98.png" alt="" class="wp-image-14769" srcset="https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.12.45-1200x98.png 1200w , https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.12.45-300x25.png 300w , https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.12.45-768x63.png 768w , https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.12.45-1536x126.png 1536w , https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.12.45-400x33.png 400w , https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.12.45.png 1956w " sizes="(max-width: 1200px) 100vw, 1200px" /></figure>
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<h2>Coming from garbage-collected languages</h2>
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<p>One of the biggest benefits of using a systems programming language is the ability to have control over low-level details.</p>
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<p>Rust gives you the choice of storing data on the stack or on the heap and determines at compile time when memory is no longer needed and can be cleaned up. This allows efficient usage of memory as well as more performant memory access. <a href="https://www.tilde.io/">Tilde</a>, an early production user of Rust in their <a href="https://www.skylight.io/">Skylight</a> product, found they were able to <a href="https://www.rust-lang.org/static/pdfs/Rust-Tilde-Whitepaper.pdf">reduce their memory usage from 5GiB to 50MiB</a> by rewriting certain Java HTTP endpoints in idiomatic Rust. Savings like this quickly add up when cloud providers charge premium prices for increased memory or additional nodes.</p>
|
||
|
||
|
||
|
||
<p>Without the need to have a garbage collector continuously running, Rust projects are well-suited to be used as libraries by other programming languages via foreign-function interfaces. This allows existing projects to replace performance-critical pieces with speedy Rust code without the memory safety risks inherent with other systems programming languages. Some projects have even been <a href="https://people.gnome.org/~federico/blog/librsvg-is-almost-rustified.html">incrementally rewritten in Rust</a> using these techniques.</p>
|
||
|
||
|
||
|
||
<p>With direct access to hardware and memory, Rust is an ideal language for embedded and bare-metal development. You can write extremely low-level code, such as <a href="https://os.phil-opp.com/">operating system kernels</a> or <a href="https://docs.rust-embedded.org/discovery/">microcontroller applications</a>. Rust’s core types and functions as well as reusable library code shine in these especially challenging environments.</p>
|
||
|
||
|
||
|
||
<h2>Coming from other systems programming languages</h2>
|
||
|
||
|
||
|
||
<p>To many people, Rust is largely viewed as an alternative to other systems programming languages, like C or C++. The biggest benefit Rust can provide compared to these languages is the <em>borrow checker</em>. This is the part of the compiler responsible for ensuring that references do not outlive the data they refer to, and it helps eliminate entire classes of bugs caused by memory unsafety.</p>
|
||
|
||
|
||
|
||
<p>Unlike many existing systems programming languages, Rust doesn’t require that you spend all of your time mired in nitty-gritty details. Rust strives to have as many <em>zero-cost abstractions</em> as possible—abstractions that are as equally as performant as the equivalent hand-written code. In this example, we show how iterators, a primary Rust abstraction, can be used to succinctly create a vector containing the first ten square numbers.</p>
|
||
|
||
|
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|
||
<figure class="wp-block-image size-large"><img src="https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.13.53-1200x25.png" alt="" class="wp-image-14770" srcset="https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.13.53-1200x25.png 1200w , https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.13.53-300x6.png 300w , https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.13.53-768x16.png 768w , https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.13.53-1536x31.png 1536w , https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.13.53-400x8.png 400w , https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.13.53.png 1956w " sizes="(max-width: 1200px) 100vw, 1200px" /></figure>
|
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|
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|
||
|
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|
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|
||
<p>When safe Rust isn’t able to express some concept, <a href="http://cliffle.com/p/dangerust/">you can use <em>unsafe</em> Rust</a>. This unlocks a few extra powers, but in exchange the programmer is now responsible for ensuring that the code is truly safe. This unsafe code can then be wrapped in higher-level abstractions which guarantee that all uses of the abstraction are safe.</p>
|
||
|
||
|
||
|
||
<p>Using unsafe code should be a calculated decision, as using it correctly requires as much thought and care as any other language where you are responsible for avoiding <a href="https://raphlinus.github.io/programming/rust/2018/08/17/undefined-behavior.html">undefined behavior</a>. Minimizing unsafe code is the best way to minimize the possibilities for segfaults and vulnerabilities due to memory unsafety.</p>
|
||
|
||
|
||
|
||
<p>Systems programming languages have the implicit expectation that they will be around effectively forever. While some modern development doesn’t require that amount of longevity, many businesses want to know that their fundamental code base will be usable for the foreseeable future. Rust recognizes this and has made conscious design decisions around backwards compatibility and stability; it’s a language <a href="https://www.youtube.com/watch?v=A3AdN7U24iU">designed for the next 40 years</a>.</p>
|
||
|
||
|
||
|
||
<h2>The Rust ecosystem</h2>
|
||
|
||
|
||
|
||
<p>The Rust experience is larger than a language specification and a compiler; many aspects of creating and maintaining production-quality software are treated as first-class citizens. Multiple concurrent Rust toolchains can be installed and managed via <a href="https://rustup.rs/">rustup</a>. Rust installations come with Cargo, a command line tool to manage dependencies, run tests, generate documentation, and more. Because dependencies, tests, and documentation are available by default, their usage is prevalent. <a href="https://crates.io/">crates.io</a> is the community site for sharing and discovering Rust libraries. Any library published to crates.io will have its documentation built and published on <a href="https://docs.rs/">docs.rs</a>.</p>
|
||
|
||
|
||
|
||
<p>In addition to the built-in tools, the Rust community has created a large number of development tools. Benchmarking, fuzzing, and property-based testing are all easily accessible and well-used in projects. Extra compiler lints are available from <a href="https://github.com/rust-lang/rust-clippy">Clippy</a> and automatic idiomatic formatting is provided by <a href="https://github.com/rust-lang/rustfmt">rustfmt</a>. IDE support is healthy and growing more capable every day.</p>
|
||
|
||
|
||
|
||
<p>Going beyond technical points, Rust has a vibrant, welcoming community. There are several official and unofficial avenues for people to get help, such as the <a href="https://discord.gg/rust-lang">chat</a>, the <a href="https://users.rust-lang.org/">user’s forum</a>, the <a href="https://www.reddit.com/r/rust/">Rust subreddit</a>, and, of course, Stack Overflow <a href="https://stackoverflow.com/questions/tagged/rust">questions and answers</a> and <a href="https://chat.stackoverflow.com/rooms/62927/rust">chatroom</a>. Rust has a <a href="https://www.rust-lang.org/policies/code-of-conduct">code of conduct</a> enforced by an awesome moderation team to make sure that the official spaces are welcoming, and most unofficial spaces also observe something similar.</p>
|
||
|
||
|
||
|
||
<p>Offline, Rust has multiple conferences across the globe, such as <a href="https://rustconf.com/">RustConf</a>, <a href="https://rust-belt-rust.com/">Rust Belt Rust</a>, <a href="https://blog.rustfest.eu/">RustFest</a>, <a href="https://rustlatam.org/">Rust Latam</a>, <a href="https://rustcon.asia/">RustCon Asia</a>, and more.</p>
|
||
|
||
|
||
|
||
<h2>It’s not all roses</h2>
|
||
|
||
|
||
|
||
<p>Rust’s strong type system and emphasis on memory safety—all enforced at compile time—mean that it’s extremely common to get errors when compiling your code. This can be a frustrating feeling for programmers not used to such an opinionated programming language. However, the Rust developers have spent a large amount of time working to improve the error messages to ensure that they are clear and actionable. Don’t let your eyes gloss over while reading Rust errors!</p>
|
||
|
||
|
||
|
||
<p>It’s especially common to hear someone complain that they’ve been “fighting the borrow checker.” While these errors can be disheartening, it’s important to recognize that each of the locations identified had the potential to introduce bugs and potential vulnerabilities in a language that didn’t perform the same checks.</p>
|
||
|
||
|
||
|
||
<p>In this example, we create a mutable string containing a name, then take a reference to the first three bytes of the name. While that reference is outstanding, we attempt to mutate the string by clearing it. There’s now no guarantee that the reference points to valid data and dereferencing it could lead to undefined behavior, so the compiler stops us:</p>
|
||
|
||
|
||
|
||
<figure class="wp-block-image size-large"><img src="https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.14.34-1200x147.png" alt="" class="wp-image-14771" srcset="https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.14.34-1200x147.png 1200w , https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.14.34-300x37.png 300w , https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.14.34-768x94.png 768w , https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.14.34-1536x188.png 1536w , https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.14.34-400x49.png 400w , https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.14.34.png 1956w " sizes="(max-width: 1200px) 100vw, 1200px" /></figure>
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||
<figure class="wp-block-image size-large"><img src="https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.15.06-1200x270.png" alt="" class="wp-image-14772" srcset="https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.15.06-1200x270.png 1200w , https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.15.06-300x67.png 300w , https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.15.06-768x173.png 768w , https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.15.06-1536x346.png 1536w , https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.15.06-400x90.png 400w , https://149351115.v2.pressablecdn.com/wp-content/uploads/2020/01/Screen-Shot-2020-01-19-at-22.15.06.png 1956w " sizes="(max-width: 1200px) 100vw, 1200px" /></figure>
|
||
|
||
|
||
|
||
|
||
|
||
<p>Helpfully, the error message incorporates our code and tries its hardest to explain the problem, pointing out exact locations.</p>
|
||
|
||
|
||
|
||
<p>Prototyping solutions in Rust can be challenging due to its statically-typed nature and because Rust requires covering 100% of the conditions, not just 99%. Edge cases must have applicable code, even when the programmer doesn’t yet know what the happy path should do. During early development, these edge cases can often be addressed by causing the program to crash, and then rigorous error handling can be added at a later point. This is a different workflow than in languages such as Ruby, where developers often try out code in a REPL and then move that to a prototype without considering error cases at all.</p>
|
||
|
||
|
||
|
||
<p>Rust is still relatively new, which means that some desired libraries may not be available yet. The upside is there’s plenty of fertile ground to develop these needed libraries, perhaps even taking advantage of recent developments in the relevant computer science fields. Due to this and Rust’s capabilities, some of Rust’s libraries, such as the <a href="https://github.com/rust-lang/regex">regex</a> crate, are the best-in-breed across any language.</p>
|
||
|
||
|
||
|
||
<p>While Rust has a strong commitment to stability and backwards compatibility, that doesn’t imply the language is finalized. A specific problem may not have access to language features that would make it simpler to express or perhaps even possible to express. As an example, Rust has had asynchronous futures for over three years, but stable <a href="https://blog.rust-lang.org/2019/11/07/Async-await-stable.html"><code>async</code> / <code>await</code></a> support in the language itself is only a few months old.</p>
|
||
|
||
|
||
|
||
<p>The Rust compiler is built on top of <a href="https://llvm.org/">LLVM</a>, which means that the number of target platforms will be smaller than C or C++.</p>
|
||
|
||
|
||
|
||
<h2>Come and join us!</h2>
|
||
|
||
|
||
|
||
<p>Regardless of which programming languages you love now, there’s bound to be something that excites or intrigues you about Rust. These are some of the reasons why I and others love Rust so much, and there’s many more. If you are looking for extra structure in your project, faster or more efficient code, or the ability to write performant code more quickly and safely, it’s time for you to see if Rust will be <em>your</em> next most-loved language!<br></p>
|
||
</div>
|
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|
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<h2 class="section-title section-title--secondary section-title--orange-underline">Author</h2>
|
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<div class="m-author">
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<span class="avatar" itemprop="avatar"><img class="avatar__image" src="https://secure.gravatar.com/avatar/f87a220e9c58c1cacfd615ad9d9d9f4f?s=96&d=mm&r=g"/></span>
|
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<div class="m-author__header-content">
|
||
<div class="m-author__name">Jake Goulding</div>
|
||
<div class="m-author__title"></div>
|
||
</div>
|
||
</div>
|
||
|
||
<div class="m-author__description">Jake is the co-founder of <a href="https://www.integer32.com/">Integer 32</a>, the world's first Rust consultancy. He also co-produced the <a href="https://www.manning.com/livevideo/rust-in-motion?a_aid=jgoulding&a_bid=6a993c2e">Rust in Motion video series</a> for Manning and is an organizer of <a href="http://www.rust-belt-rust.com/">Rust Belt Rust</a>, a Rust conference located in the Rust Belt area of the United States.</div>
|
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<a class="m-author__meta-item" href="https://stackoverflow.blog/authors/jgoulding/">Author Archives</a><a class="m-author__meta-item" href="https://www.integer32.com/" target="blank">Website</a><a class="m-author__meta-item" href="https://twitter.com/JakeGoulding" target="blank">Twitter</a><a class="m-author__meta-item" href="https://github.com/shepmaster" target="blank">Github</a><a class="m-author__meta-item" href="https://stackoverflow.com/users/155423/shepmaster" target="blank">Stack Overflow</a><a class="m-author__meta-item" href="https://www.youtube.com/channel/UCptxtVyJkQAJZcFwBbIDZcgv" target="blank">Youtube</a>
|
||
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|
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</div>
|
||
|
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</div>
|
||
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<div class="column is-half">
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<h2 class="section-title section-title--secondary section-title--orange-underline">Tags</h2>
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<ul class="m-tag-list"><li class="m-tag-list__item m-tag-list__item--bulletin"><a href="https://stackoverflow.blog/tags/bulletin/" class="m-tag-list__link">Bulletin</a></li><li class="m-tag-list__item m-tag-list__item--code-for-a-living"><a href="https://stackoverflow.blog/code-for-a-living/" class="m-tag-list__link">Code for a Living</a></li><li class="m-tag-list__item m-tag-list__item--stackoverflow"><a href="https://stackoverflow.blog/tags/stackoverflow/" class="m-tag-list__link">Stackoverflow</a></li></ul>
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<div class="m-post-card__meta"><span class="posted-on-container"><span class="author vcard" itemprop="author"><a class="url fn n" href="https://stackoverflow.blog/authors/benpopper/"></a><span class="author-name">by <a class="url fn n" href="https://stackoverflow.blog/authors/benpopper/">Ben Popper</a></span></span><span class="date"> on <time class="entry-date published updated" datetime="2019-09-17T10:39:47-04:00">September 17, 2019</time></span></span></div>
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What inspires someone to become a software developer? Joel Spolsky and Clive Thompson discuss how the culture of coding has evolved over the decades and where they hope it’s headed...
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<h2 class="m-post-card__title" itemprop="headline"><a href="https://stackoverflow.blog/2020/01/16/how-to-create-micro-interactions-with-react-spring-part-1/">How to create micro-interactions with react-spring: Part 1</a></h2>
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In this series, we’ll examine how to take your application from ordinary to exceptional by implementing micro-interactions with react-spring so you won’t be stuck thinking “I really wish I knew...
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<img alt='' src='https://secure.gravatar.com/avatar/5a227fe9ea17e9ff2f5788af3015f3a9?s=32&d=mm&r=g' srcset='https://secure.gravatar.com/avatar/5a227fe9ea17e9ff2f5788af3015f3a9?s=64&d=mm&r=g 2x' class='avatar avatar-32 photo' height='32' width='32' /><div class="lh-sm"><cite class="fw-bold fs-normal">Jeremy Banks</cite> <span class="fc-black-600 sm:d-none">says:</span></div>
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<a class="fc-black-400" href="https://stackoverflow.blog/2020/01/20/what-is-rust-and-why-is-it-so-popular/#comment-554074">January 20, 2020 at 11:27 am </a>
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<p>This is the kind of content I love to see on this blog. Thanks for all you do, Shep</p>
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