merge jasonmoo/t.js#24

Author: glaszig

app/assets/javascripts/t.js

@@ -30,14 +30,12 @@
   }
 
   function get_value(vars, key) {
-    var parts = key.split('.');
-    while (parts.length) {
-      if (!(parts[0] in vars)) {
-        return false;
-      }
-      vars = vars[parts.shift()];
-    }
-    return vars;
+    return key
+    .split('.')
+    .reduce(
+      (out, part) => (out instanceof Map ? out.get(part) : out[part]) ?? false,
+      vars
+    );
   }
 
   function render(fragment, vars) {
@@ -67,22 +65,18 @@
 
         // process array/obj iteration
         if (meta == '@') {
-          // store any previous vars
-          // reuse existing vars
-          _ = vars._key;
-          __ = vars._val;
-          for (i in val) {
-            if (val.hasOwnProperty(i)) {
-              vars._key = i;
-              vars._val = val[i];
-              temp += render(inner, vars);
-            }
-          }
-          vars._key = _;
-          vars._val = __;
-          return temp;
+          return Array.from(
+            !!val?.[Symbol.iterator] ? val.entries() : Object.entries(val),
+            ([_key, _val]) => render(
+              inner,
+              {
+                ...vars,
+                _key,
+                _val,
+              }
+            )
+          ).join('');
         }
-
       })
       .replace(valregex, function(_, meta, key) {
         var val = get_value(vars,key);