diff --git a/src/index.js b/src/index.js
index d54b3622..4836253e 100644
--- a/src/index.js
+++ b/src/index.js
@@ -1,12 +1,11 @@
-
 exports.min = function min (array) {
-  return 0;
+    return  (!array || array.length == 0) ? 0 : array.reduce((min, cur) => min <= cur ? min : cur);
 }
 
 exports.max = function max (array) {
-  return 0;
+    return  (!array || array.length == 0) ? 0 : array.reduce((max, cur) => max >= cur ? max : cur);
 }
 
 exports.avg = function avg (array) {
-  return 0;
+    return (!array || array.length == 0) ? 0 : array.reduce((prev, cur) => prev + cur) / array.length;
 }