Add utils folder

Author: gaearon

src/addons/dispatch.js

@@ -1,6 +1,6 @@
 import React from 'react';
 import Dispatcher from '../Dispatcher';
-import getDisplayName from './getDisplayName';
+import getDisplayName from '../utils/getDisplayName';
 
 export default function dispatch(store) {
   return DecoratedComponent => class DispatcherDecorator {

src/addons/inject.js

@@ -1,6 +1,6 @@
 import React from 'react';
 import Injector from '../Injector';
-import getDisplayName from './getDisplayName';
+import getDisplayName from '../utils/getDisplayName';
 
 function mergeAll({ props, atom, actions }) {
   return { ...props, ...atom, ...actions };

src/addons/getDisplayName.js renamed to src/utils/getDisplayName.js

@@ -0,0 +1,31 @@
+export default function shallowEqual(objA, objB) {
+  if (objA === objB) {
+    return true;
+  }
+
+  var keysA = Object.keys(objA);
+  var keysB = Object.keys(objB);
+
+  if (keysA.length !== keysB.length) {
+    return false;
+  }
+
+  // Test for A's keys different from B.
+  var hasOwn = Object.prototype.hasOwnProperty;
+  for (var i = 0; i < keysA.length; i++) {
+    if (!hasOwn.call(objB, keysA[i]) ||
+        objA[keysA[i]] !== objB[keysA[i]]) {
+
+      return false;
+    }
+
+    var valA = objA[keysA[i]];
+    var valB = objB[keysA[i]];
+
+    if (valA !== valB) {
+      return false;
+    }
+  }
+
+  return true;
+}

src/utils/shallowEqual.js

@@ -0,0 +1,34 @@
+export default function shallowEqualScalar(objA, objB) {
+  if (objA === objB) {
+    return true;
+  }
+
+  if (typeof objA !== 'object' || objA === null ||
+      typeof objB !== 'object' || objB === null) {
+    return false;
+  }
+
+  var keysA = Object.keys(objA);
+  var keysB = Object.keys(objB);
+
+  if (keysA.length !== keysB.length) {
+    return false;
+  }
+
+  // Test for A's keys different from B.
+  var hasOwn = Object.prototype.hasOwnProperty;
+  for (var i = 0; i < keysA.length; i++) {
+    if (!hasOwn.call(objB, keysA[i])) {
+      return false;
+    }
+
+    var valA = objA[keysA[i]];
+    var valB = objB[keysA[i]];
+
+    if (valA !== valB || typeof valA === 'object' || typeof valB === 'object') {
+      return false;
+    }
+  }
+
+  return true;
+}