Shortcut at at start for simplicity in loops

Author: blottn

lib/generate.js

@@ -19,6 +19,11 @@ module.exports = function generate(before, after) {
   before = serialize(before);
   after = serialize(after);
 
+  // An undefined target is a deletion attempt
+  if (after === undefined) {
+    return null;
+  }
+
   if (!(before instanceof Object) &&
       !(after instanceof Object) &&
       before === after) { // Return no op when values match
@@ -33,10 +38,8 @@ module.exports = function generate(before, after) {
 
   let patch = {};
   for (let key of Object.keys(before)) {
-    let newVal = null;
-    if (key in after) {
-      newVal = generate(before[key], after[key]);
-    }
+    let newVal = generate(before[key], after[key]);
+    // Omit noops
     if (equal(newVal, {})) {
       continue;
     }