Travis build: 1247 [custom]

test/groupBy/groupBy.js

@@ -1,5 +1,5 @@
-module.exports = groupBy = (arr, func) =>
-arr.map(typeof func === 'function' ? func : val => val[func]).reduce((acc, val, i) => {
+module.exports = groupBy = (arr, fn) =>
+arr.map(typeof fn === 'function' ? fn : val => val[fn]).reduce((acc, val, i) => {
 acc[val] = (acc[val] || []).concat(arr[i]);
 return acc;
 }, {});