hash-map and array-map

Author: borkdude

cherry/.gitignore

@@ -7,3 +7,4 @@ node_modules
 lib
 report.html
 test/scratch.js
+dist

cherry/corpus/core_vars.cljs

@@ -1,10 +1,10 @@
 (ns core-vars)
 
-(def js-map (clj->js (assoc nil :foo :bar)))
+(def js-map (clj->js {:foo :bar}))
 
 (js/console.log js-map)
 
-(def clj-map (assoc nil :foo/bar (+ 1 2 3)))
+(def clj-map {:foo/bar (+ 1 2 3)})
 
 (js/console.log (get clj-map :foo/bar)) ;; => 6
 

cherry/corpus/core_vars.mjs

@@ -1,7 +1,7 @@
-import { toJs, get, keyword, str, assoc } from 'cherry-cljs/cljs.core.js'
+import { toJs, get, keyword, str, arrayMap } from 'cherry-cljs/cljs.core.js'
 
-const js_map = toJs(assoc(null, keyword("foo"), keyword("bar")));
+const js_map = toJs(arrayMap(keyword("foo"), keyword("bar")));
 console.log(js_map);
-const clj_map = assoc(null, keyword("foo/bar"), (1 + 2 + 3));
+const clj_map = arrayMap(keyword("foo/bar"), (1 + 2 + 3));
 console.log(get(clj_map, keyword("foo/bar")));
 console.log(str(clj_map));

cherry/package.json

@@ -2,7 +2,7 @@
   "type": "module",
   "name": "cherry-cljs",
   "sideEffects": false,
-  "version": "0.0.0-alpha.4",
+  "version": "0.0.0-alpha.5",
   "files": [
     "cljs.core.js",
     "lib/cljs_core.js"

cherry/shadow-cljs.edn

@@ -18,7 +18,9 @@
                           toCljs cljs.core/js->clj
                           dissoc cljs.core/dissoc
                           conj cljs.core/conj
-                          get cljs.core/get}}
+                          get cljs.core/get
+                          arrayMap cljs.core/array-map
+                          hashMap cljs.core/hash-map}}
     #_#_:transpiler {}}
    :build-hooks [(shadow.cljs.build-report/hook
                   {:output-to "report.html"})]}}}

cherry/src/cherry/transpiler.clj

@@ -102,7 +102,9 @@
                       dissoc conj vector clj->js js->clj get]))
 
 (def core->js '{clj->js toJs
-                js->cljs toCljs})
+                js->cljs toCljs
+                hash-map hashMap
+                array-map arrayMap})
 
 (def prefix-unary-operators (set ['!]))
 
@@ -404,8 +406,13 @@
   (emit (into [] expr)))
 
 (defmethod emit clojure.lang.IPersistentMap [expr]
-  (letfn [(json-pair [pair] (str (emit (key pair)) ": " (emit (val pair))))]
-    (str "{" (str/join ", " (map json-pair (seq expr))) "}")))
+  (let [map-fn
+        (if (<= (count expr) 8)
+          'arrayMap
+          'hashMap)]
+    (swap! *imported-core-vars* conj map-fn)
+    (letfn [(mk-pair [pair] (str (emit (key pair)) ", " (emit (val pair))))]
+      (format "%s(%s)" map-fn (str/join ", " (map mk-pair (seq expr)))))))
 
 (defn _js [forms]
   (with-var-declarations