diff --git a/Exercises/2-compose.js b/Exercises/2-compose.js
index 368e521..9530138 100644
--- a/Exercises/2-compose.js
+++ b/Exercises/2-compose.js
@@ -1,5 +1,22 @@
'use strict';
-const compose = (...fns) => x => null;
+const compose = (...fns) => {
+ let error = null;
+ try {
+ for (const fn of fns) {
+ if (!(fn instanceof Function)) throw new Error('Type of argument should be a function.');
+ }
+ } catch (e) {
+ error = e;
+ }
+ const composed = x => {
+ if (error) return undefined;
+ return fns.reduceRight((v, f) => f(v), x);
+ }
+ composed.on = (eventName, callback) => {
+ if (eventName === 'error' && error) callback(error);
+ }
+ return composed;
+}
module.exports = { compose };
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