ref(nvim): merged utils into helpers

.config/nvim/fnl/helpers.fnl

@@ -9,4 +9,26 @@
 (lambda M.snd [obj]
   (. obj 2))
 
+(lambda M.map [tbl f]
+  (let [t {}]
+    (each [k v (pairs tbl)] (tset t k (f v)))
+    t))
+
+(lambda M.foreach [tbl f]
+  (each [k v (pairs tbl)] (f k v)))
+
+(lambda M.contains [tbl elem]
+  (each [_ v (pairs tbl)] (when (= v elem) (lua "return true")) false))
+
+(lambda M.filter [tbl pred]
+  (let [t {}]
+    (each [k v (pairs tbl)] (when (pred v) (tset t k v)))
+    t))
+
+(lambda M.concat [tbl1 tbl2]
+  (let [t {}]
+    (each [k v (pairs tbl1)] (tset t k v))
+    (each [k v (pairs tbl2)] (tset t k v))
+    t))
+
 M