MERN Full Stack · React
Why does React need a key for each item in a list?
Student 1
Why does React need a key for each item in a list?
Faculty
A stable key lets React match an item with its previous render when the list changes. Use a record ID when one is available.
Student 2
Can I use the array index for a list of forum replies?
Faculty
Use each reply's ID. Replies may be inserted, removed, or reordered, and array indexes would then refer to different replies.