generate new test that did already exist & update all module snippets with declaration

test/mapObject/mapObject.js

@@ -1,4 +1,4 @@
-module.exports = (arr, fn) =>
+module.exports = mapObject = (arr, fn) =>
 (a => (
 (a = [arr, arr.map(fn)]), a[0].reduce((acc, val, ind) => ((acc[val] = a[1][ind]), acc), {})
 ))();