A few years ago I solved 200 LeetCode problems and still froze on Mediums I hadn't seen. The breakthrough wasn't another hundred problems. It was a different loop. A problem asks for the longest substring with at most K distinct characters. You've solved sliding window before. Maximum sum subarray of size K, done. Longest substring without repeating characters, done. This third one stalls you. Twe
In web development, there is one golden rule: Never trust user input. Whether it is a login form, a search bar, or an environment variable, unvalidated data is a leading cause of bugs and security vulnerabilities. For a long time, developers relied on manual if/else checks or complex Regex to validate data. But then came Zod. Imagine you have an endpoint that receives a user profile. Without a sch