add hw2

node_modules/ramda/es/groupBy.js

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+import _checkForMethod from "./internal/_checkForMethod.js";
+import _curry2 from "./internal/_curry2.js";
+import reduceBy from "./reduceBy.js";
+/**
+ * Splits a list into sub-lists stored in an object, based on the result of
+ * calling a key-returning function on each element, and grouping the
+ * results according to values returned.
+ *
+ * Dispatches to the `groupBy` method of the second argument, if present.
+ *
+ * Acts as a transducer if a transformer is given in list position.
+ *
+ * @func
+ * @memberOf R
+ * @since v0.1.0
+ * @category List
+ * @typedefn Idx = String | Int | Symbol
+ * @sig Idx a => (b -> a) -> [b] -> {a: [b]}
+ * @param {Function} fn Function :: a -> Idx
+ * @param {Array} list The array to group
+ * @return {Object} An object with the output of `fn` for keys, mapped to arrays of elements
+ *         that produced that key when passed to `fn`.
+ * @see R.reduceBy, R.transduce, R.indexBy
+ * @example
+ *
+ *      const byGrade = R.groupBy(function(student) {
+ *        const score = student.score;
+ *        return score < 65 ? 'F' :
+ *               score < 70 ? 'D' :
+ *               score < 80 ? 'C' :
+ *               score < 90 ? 'B' : 'A';
+ *      });
+ *      const students = [{name: 'Abby', score: 84},
+ *                      {name: 'Eddy', score: 58},
+ *                      // ...
+ *                      {name: 'Jack', score: 69}];
+ *      byGrade(students);
+ *      // {
+ *      //   'A': [{name: 'Dianne', score: 99}],
+ *      //   'B': [{name: 'Abby', score: 84}]
+ *      //   // ...,
+ *      //   'F': [{name: 'Eddy', score: 58}]
+ *      // }
+ */
+
+var groupBy =
+/*#__PURE__*/
+_curry2(
+/*#__PURE__*/
+_checkForMethod('groupBy',
+/*#__PURE__*/
+reduceBy(function (acc, item) {
+  acc.push(item);
+  return acc;
+}, [])));
+
+export default groupBy;