0 to 1 https://www.pratyushkamal.in/blog/ Sharing my thoughts on what I learn, while I learn. en nums.size() vs int n = nums.size() in a For Loop: Which One Should You Actually Use? https://www.pratyushkamal.in/blog/nums-size-vs-cached-n-for-loop/ https://www.pratyushkamal.in/blog/nums-size-vs-cached-n-for-loop/ Why caching nums.size() into an int isn't about speed. It's about dodging an unsigned-integer wraparound bug that only shows up the moment your input is empty. Sat, 01 Aug 2026 00:00:00 GMT NULL vs Empty String: Why "No Data" Isn't Always the Same Thing https://www.pratyushkamal.in/blog/null-vs-empty-string/ https://www.pratyushkamal.in/blog/null-vs-empty-string/ NULL and '' both look like "no data" at a glance, but they answer different questions, and mixing them up quietly breaks aggregates, filters, and BI tools. Fri, 17 Jul 2026 00:00:00 GMT Slowly Changing Dimensions (SCD): What They Are and How to Actually Choose the Right One https://www.pratyushkamal.in/blog/slowly-changing-dimensions-scd/ https://www.pratyushkamal.in/blog/slowly-changing-dimensions-scd/ A practical walkthrough of SCD types 0 through 6, and a simple decision tree for picking the right one instead of memorizing all of them. Tue, 28 Apr 2026 00:00:00 GMT