Feature Request: Vector concatentation special form

[benzap]

When working with a similar library rum, the hiccup-style vector is forgiving when having a nested vector, and will concatenate the first-depth of the nested vector

ex.

;; ....
[:div
  [:div "first element"]
  [[:div "second element"] [:div "third element"]]] ;; note the nested elements in the vector

;; before being rendered, the structure takes the form of:
[:div
 [:div "first element"]
 [:div "second element"]
 [:div "third element"]

This improves the expressiveness when constructing forms by allowing multiple forms to be included in a conditional form

;; ....
[:div
 [:div "some element"]
 (if truthy-stmt
     [[:div "true"] [:div "foo"]] ;; note that the two elements are wrapped in a vector
     [[:div "false"] [:div "bar"]])]

;; before being rendered, the structure takes the form of either
;; truthy
[:div
 [:div "some element"]
 [:div "true"]
 [:div "foo"]]

;; falsy
[:div
 [:div "some element"]
 [:div "false"]
 [:div "bar"]]

Alternatively, an explicit concatentation keyword could be introduced to express intent:

;; ....
[:div
  [:div "first element"]
  [:& ;; note the use of `:& to represent concatenation
   [:div "second element"]
   [:div "third element"]]]

;; when rendered:
[:div
 [:div "first element"]
 [:div "second element"]
 [:div "third element"]

I feel like this functionality can be a great way to improve many situations where multiple forms need to be concatenated, and remove unnecessary :div wrappers that lead to difficult css styling issues that are imposed when working with nested DIVs.

Please consider my enhancement, thank you,

Ben. Z

[benzap]

This is apparently very similar to React Fragments #319 which was already merged #352, and has been available since Reagent 0.8.0

Closing since this feature already exists in the form:

[:div
  [:div "first element"]
  [:<>
   [:div "second element"]
   [:div "third element"]]]