--- title: Best 30 seconds of code posts — December 2023 | daily.dev description: The most upvoted 30 seconds of code posts from December 2023, curated by the daily.dev community. canonical: https://daily.dev/sources/30seconds/best-of/2023/12 twitter:card: summary_large_image twitter:site: @dailydotdev og:url: https://daily.dev/sources/30seconds/best-of/2023/12 og:type: website og:site_name: daily.dev og:title: Best 30 seconds of code posts — December 2023 | daily.dev og:description: The most upvoted 30 seconds of code posts from December 2023, 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 — December 2023 1. 1 [](https://daily.dev/posts/generate-a-uuid-in-javascript-hwehuzalg "Generate a UUID in JavaScript") Article 30 seconds of code · 3y Generate a UUID in JavaScript Learn how to generate a Universally Unique Identifier (UUID) in JavaScript using the Crypto API. This post provides options for generating UUIDs in different environments and discusses their relevance. 29 2. 2 [](https://daily.dev/posts/function-composition-in-javascript-zkmthgfer "Function composition in JavaScript") Article 30 seconds of code · 3y Function composition in JavaScript Function composition in JavaScript is the process of combining multiple functions to produce a new function. It provides readability, reusability, and modularity. 25 3. 3 [](https://daily.dev/posts/an-introduction-to-functional-programming-srkarjkyh "An introduction to functional programming") Article 30 seconds of code · 3y An introduction to functional programming Functional programming is a programming paradigm that emphasizes the application of functions and avoids changing state and mutable data. Core concepts include pure functions, immutability, higher-order functions, and recursion. Benefits of functional programming include easier reasoning about code, testability, and reusability. 22 4. 4 [](https://daily.dev/posts/understanding-javascript-currying-1eduvugs6 "Understanding JavaScript currying") Article 30 seconds of code · 3y Understanding JavaScript currying Currying is a process that transforms a function that takes multiple arguments into a series of functions that each take a single argument. This makes code more flexible and reusable. In JavaScript, currying can be done by creating a curry() function using recursion. Variadic functions, which accept a variable number of arguments, require additional considerations for currying. 15 [See all 30 seconds of code archives](/sources/30seconds/best-of) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@graph":[{"@type":"CollectionPage","@id":"https://daily.dev/sources/30seconds/best-of/2023/12#page","url":"https://daily.dev/sources/30seconds/best-of/2023/12","name":"Best 30 seconds of code Posts — December 2023","description":"The most upvoted 30 seconds of code posts from December 2023, curated by the daily.dev community.","isPartOf":{"@type":"WebSite","url":"https://daily.dev"}},{"@type":"ItemList","@id":"https://daily.dev/sources/30seconds/best-of/2023/12#items","numberOfItems":4,"itemListElement":[{"@type":"ListItem","position":1,"url":"https://daily.dev/posts/generate-a-uuid-in-javascript-hwehuzalg","name":"Generate a UUID in JavaScript"},{"@type":"ListItem","position":2,"url":"https://daily.dev/posts/function-composition-in-javascript-zkmthgfer","name":"Function composition in JavaScript"},{"@type":"ListItem","position":3,"url":"https://daily.dev/posts/an-introduction-to-functional-programming-srkarjkyh","name":"An introduction to functional programming"},{"@type":"ListItem","position":4,"url":"https://daily.dev/posts/understanding-javascript-currying-1eduvugs6","name":"Understanding JavaScript currying"}]},{"@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Sources","item":"https://daily.dev/sources"},{"@type":"ListItem","position":3,"name":"30 seconds of code","item":"https://daily.dev/sources/30seconds"},{"@type":"ListItem","position":4,"name":"Best of","item":"https://daily.dev/sources/30seconds/best-of"},{"@type":"ListItem","position":5,"name":"December 2023"}]}]} ```