A minimalistic ClojureScript interface to React.js
p-himik 2021-01-30T12:14:52.029Z

Has anyone seen a strange reagent.core/with-let behavior where it just swallows some exception and keeps going as if the rest of the bindings were all set to undefined? I can see it in a fairly complex app but I'm struggling to reproduce it in a simple setup at the moment.

p-himik 2021-01-30T13:01:49.029100Z

Came up with an MRE, created

jaime 2021-01-30T20:13:58.030Z

Sorry for the confusion... "If you want optional arguments, you can use multi-arities or a map with optional keys. That's all I can say right now." Actually the multi arity is what I'm trying to avoid, because then I have to check if the first param is map (meaning its a props), otherwise its a child, and if second param also has value, then I have to combine first and second param as child. Lets say if I made it this way..

(defn text [props & children]) 
;; props is "Hey", children is nil
[text "Hey"]

;; props is map, children is (("Hey"))
[text {:style {:fontSize 16}} "Hey"]

;; props is map, children is ([text "Hey"])
[text {:style {:fontSize 16}} [text "Hey"]]

;; props is [text "Child 1"], children is ([text "Child 2"])
[text [text "Child 1"] [text "Child 2"]]

;; props is map, children list of [text]
      {:style {:color "red"}}
      [text "with color Child 1"]
      [text "with color child 2"]]

jaime 2021-01-30T20:15:53.030300Z

In the above example, I have to handle inconsistency of the params (props and children) if I will be using the function params. And what I'm trying to point out is, its better not to use the params, and just rely on (r/props) and (r/children) to get consistency. (Consistency here meaning, props will always be a map, and first children will not be in the props function param in cases I did not pass style map in the component), reagent knows it is a children

p-himik 2021-01-30T21:00:28.030800Z

You don't have to check anything if you don't have the same arity that accepts different types:

(defn my-view
  ([arg] ...)
  ([arg1 arg2] ...))

p-himik 2021-01-30T21:00:59.031100Z

But it won't work if you want to be able to accept varargs.

p-himik 2021-01-30T21:01:38.031300Z

And if you do want that, you have pretty much outlined the available options yourself.