All 12 useState & useEffect Mistakes Junior React Developers Still Make in 2026

👉 NEW React & Next.js Course: https://bytegrad.com/courses/professi... Hi, I'm Wesley. I'm a brand ambassador for Kinde (paid sponsorship). 👉 Add auth to your app FAST: https://bit.ly/3QOe1Bh 👉 NEW React & Next.js Course: https://bytegrad.com/courses/professi... 👉 Professional JavaScript Course: https://bytegrad.com/courses/professi... 👉 Professional CSS Course: https://bytegrad.com/courses/professi... 👉 Discord: all my courses have a private Discord where I actively participate 🔔 Email newsletter (BIG update soon): https://email.bytegrad.com ⏱️ Timestamps: 0:00 Intro 0:06 12/12 - State updates aren't immediate 2:35 11/12 - Conditional rendering 4:46 10/12 - Updating object state 7:59 9/12 - 1 Object state instead of multiple smaller ones 11:25 8/12 - Information can be derived from state / props 14:32 7/12 - Primitives vs non-primitives 19:05 6/12 - Initializing state with object 22:12 5/12 - TypeScript mistakes 27:19 4/12 - Not using custom hooks 30:59 3/12 - Server & Client components 33:08 2/12 - Stale closure 38:42 1/12 - Fetching in useEffect #webdevelopment #programming #coding Note that my videos may contain mistakes. Always verify yourself that your code is safe and does what you want it to do for your specific situation. You agree by watching the videos that you are solely responsible for any mistakes in your code. This channel and all its content is owned & operated by ByteGrad Sp. z o.o. with Tax ID: PL6762676561 . . TOP resource to LEARN AI for Developers - https://datacamp.pxf.io/RGyxrR (paid sponsorship & ByteGrad Sp. z o.o. gets commission)