anyone else ever run into the issue where you define a form-2 component, but then react tries to reuse the DOM elements and things don't work properly?

What’s the symptom? Components fail to display the new values?

I get that one a lot: you have to make the new values part of your :key metadata for the component/DOM-node that’s failing to update.

yeah that fixed it

but I was wondering what the root cause is

is reagent not smart enough, or is react too aggressive?

and how do you ensure that your code is correct without just manually checking everything?

That’s a React thing https://reactjs.org/docs/lists-and-keys.html#keys - used to determine what’s new @kanwei

@oconn it is, but it's still unclear as to why some things need to be "keyed" whereas most things don't need to be

which things don't need to be keyed, that you find surprising?

keying things can also be used to route around issues with certain anti-patterns or corner cases, so I think seeing an example you found surprising would help determine if it’s a Reagent, React or user error

typically, you should only have to key elements generated from a sequence, e.g.:

[:ul
  (for [person people-sequence]
    [:li {:key (:id person)} 
     “Name: “ (:name person) “, Age: ” (:age person)])]

yeah i'll try to come up with a simple base case

it's definitely not just in seqs that this occurs