[react-packager][streamline oss] Move open sourced JS source to react-native-github

Libraries/Utilities/differ/matricesDiffer.js

@@ -0,0 +1,39 @@
+/**
+ * Copyright 2004-present Facebook. All Rights Reserved.
+ *
+ * @providesModule matricesDiffer
+ */
+'use strict';
+
+/**
+ * Unrolls an array comparison specially for matrices. Prioritizes
+ * checking of indices that are most likely to change so that the comparison
+ * bails as early as possible.
+ *
+ * @param {MatrixMath.Matrix} one First matrix.
+ * @param {MatrixMath.Matrix} two Second matrix.
+ * @return {boolean} Whether or not the two matrices differ.
+ */
+var matricesDiffer = function(one, two) {
+  if (one === two) {
+    return false;
+  }
+  return !one || !two ||
+    one[12] !== two[12] ||
+    one[13] !== two[13] ||
+    one[14] !== two[14] ||
+    one[5] !== two[5] ||
+    one[10] !== two[10] ||
+    one[1] !== two[1] ||
+    one[2] !== two[2] ||
+    one[3] !== two[3] ||
+    one[4] !== two[4] ||
+    one[6] !== two[6] ||
+    one[7] !== two[7] ||
+    one[8] !== two[8] ||
+    one[9] !== two[9] ||
+    one[11] !== two[11] ||
+    one[15] !== two[15];
+};
+
+module.exports = matricesDiffer;