ui

app/code/node_modules/collect.js/dist/methods/groupBy.js

@@ -0,0 +1,32 @@
+'use strict';
+
+var nestedValue = require('../helpers/nestedValue');
+
+var _require = require('../helpers/is'),
+    isFunction = _require.isFunction;
+
+module.exports = function groupBy(key) {
+  var _this = this;
+
+  var collection = {};
+
+  this.items.forEach(function (item, index) {
+    var resolvedKey = void 0;
+
+    if (isFunction(key)) {
+      resolvedKey = key(item, index);
+    } else if (nestedValue(item, key) || nestedValue(item, key) === 0) {
+      resolvedKey = nestedValue(item, key);
+    } else {
+      resolvedKey = '';
+    }
+
+    if (collection[resolvedKey] === undefined) {
+      collection[resolvedKey] = new _this.constructor([]);
+    }
+
+    collection[resolvedKey].push(item);
+  });
+
+  return new this.constructor(collection);
+};