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languages/why-does-5-3-give-53-in-javascript-type-coercion-step-by-step.md Why does "5" + 3 give "53" in JavaScript? Type coercion, step by step Why does `"5" + 3` give `"53"` while `"5" - 3` gives `2`? It is not random. JavaScript follows a short recipe called type coercion: it… 4 min read · 7 Oct infrastructure/what-is-a-load-balancer-one-web-address-many-servers.md What is a load balancer? One web address, many servers When you open a popular website you type one address, yet many servers stand behind it. Something has to decide which one answers you. That… 5 min read · 5 Oct computer-science/hash-tables-how-python-finds-a-key-without-searching-for-it.md Hash tables: how Python finds a key without searching for it You type `ages["cat"]` and Python answers instantly, even with a million entries. It does not search. It calculates where "cat" must be… 4 min read · 5 Oct languages/why-does-0-1-0-2-give-0-30000000000000004-in-python.md Why does 0.1 + 0.2 give 0.30000000000000004 in Python? Type 0.1 + 0.2 into Python and you get 0.30000000000000004. It is not a bug: computers store fractions in binary, and one tenth has no… 4 min read · 4 Oct infrastructure/what-is-ci-the-robot-that-tests-your-code-every-time-you-push.md What is CI? The robot that tests your code every time you push You change one line, it looks fine, and two days later something far away breaks. Continuous integration (CI) is a robot that prevents… 5 min read · 2 Oct computer-science/what-is-an-algorithm-watch-two-recipes-race-to-sort-six-bars.md What Is an Algorithm? Watch Two Recipes Race to Sort Six Bars An algorithm is a recipe so precise that someone who doesn't understand the goal could still follow it and get the right answer. Computers… 10 min read · 1 Oct infrastructure/what-is-a-server-really-a-computer-that-waits-for-questions.md What is a server, really? A computer that waits for questions A server isn't a special kind of machine. It's an ordinary computer running a program that waits for someone to ask for something, then… 10 min read · 1 Oct mobile/native-web-or-cross-platform-how-apps-get-from-your-code-to-a-phone.md Native, web or cross-platform? How apps get from your code to a phone Every app idea hits the same fork in the road. Build it native in Swift for iPhone and Kotlin for Android, build it for the web with HTML… 9 min read · 1 Oct computer-science/linear-vs-binary-search-why-30-guesses-can-beat-a-billion.md Linear vs binary search: why 30 guesses can beat a billion Need to find one item in a list? You can check every item in turn (linear search), or, if the list is sorted, look at the middle and throw… 10 min read · 1 Oct networks/how-does-example-com-turn-into-an-ip-address-dns-step-by-step.md How does example.com turn into an IP address? DNS, step by step Computers find each other by number, not by name. Before your browser can load example.com, it has to find the site's IP address, and… 11 min read · 1 Oct ai/how-a-chatbot-writes-one-guessed-word-at-a-time.md How a chatbot writes: one guessed word at a time A chatbot doesn't plan its reply and then type it out. It repeats one small step: look at the text so far, give every possible next token… 12 min read · 1 Oct computers/counting-with-only-0-and-1-how-computers-store-numbers-and-letters.md Counting with Only 0 and 1: How Computers Store Numbers and Letters Every photo, message and web page on your computer is stored as numbers written with just two digits: 0 and 1. That's binary, and it works… 9 min read · 1 Oct