--- title: Best 30 seconds of code posts — September 2022 | daily.dev description: The most upvoted 30 seconds of code posts from September 2022, curated by the daily.dev community. canonical: https://daily.dev/sources/30seconds/best-of/2022/09 twitter:card: summary_large_image twitter:site: @dailydotdev og:url: https://daily.dev/sources/30seconds/best-of/2022/09 og:type: website og:site_name: daily.dev og:title: Best 30 seconds of code posts — September 2022 | daily.dev og:description: The most upvoted 30 seconds of code posts from September 2022, curated by the daily.dev community. og:image: https://media.daily.dev/image/upload/s--VAY5ToZt--/f_auto/v1724209435/public/daily.dev%20-%20open%20graph --- # Best of 30 seconds of code — September 2022 1. 1 [](https://daily.dev/posts/javascript-array-filtering-tips-okntujfsb "JavaScript array filtering tips") Article 30 seconds of code · 4y JavaScript array filtering tips If you are looking for a single result in an array, you can use Array.prototype.find() instead. This will return the first element that satisfies the condition, or undefined if no such element exists. If you don't mind mutating the original array, it can be significantly faster than the previous one. 14 2. 2 [](https://daily.dev/posts/what-is-the-difference-between-async-and-defer-in-script-loading--tcnxhlxjl "What is the difference between async and defer in script loading?") Article 30 seconds of code · 4y What is the difference between async and defer in script loading? A plain