feat: init

node_modules/only/index.js

@@ -0,0 +1,10 @@
+
+module.exports = function(obj, keys){
+  obj = obj || {};
+  if ('string' == typeof keys) keys = keys.split(/ +/);
+  return keys.reduce(function(ret, key){
+    if (null == obj[key]) return ret;
+    ret[key] = obj[key];
+    return ret;
+  }, {});
+};