node_modules

1 files changed, 37 insertions, 0 deletions

diff --git a/node_modules/fbjs/lib/groupArray.js.flow b/node_modules/fbjs/lib/groupArray.js.flow
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+/**
+ * Copyright (c) 2013-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule groupArray
+ * @typechecks
+ */
+
+'use strict';
+
+/**
+ * Groups all items in the array using the specified function. An object will
+ * be returned where the keys are the group names, and the values are arrays of
+ * all the items in that group.
+ *
+ * @param {array} array
+ * @param {function} fn Should return a string with a group name
+ * @return {object} items grouped using fn
+ */
+
+function groupArray(array, fn) {
+  var ret = {};
+  for (var ii = 0; ii < array.length; ii++) {
+    var result = fn.call(array, array[ii], ii);
+    if (!ret[result]) {
+      ret[result] = [];
+    }
+    ret[result].push(array[ii]);
+  }
+  return ret;
+}
+
+module.exports = groupArray;
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