diff --git a/src/index.js b/src/index.js
index d54b3622..dc7a45c7 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,12 +1,15 @@
 
 exports.min = function min (array) {
-  return 0;
+  return (array != undefined && array != [] && array.length>0)? 
+  array.sort((a, b) => a - b)[0] : 0;
 }
 
 exports.max = function max (array) {
-  return 0;
+  return (array != undefined && array != [] && array.length>0)? 
+  array.sort((a, b) => a - b)[array.length-1] : 0;
 }
 
 exports.avg = function avg (array) {
-  return 0;
+  return (array != undefined && array != [] && array.length>0)? 
+  array.reduce((sum, current) => sum + current)/array.length : 0;
 }