diff --git a/functions.py b/functions.py
index ce163a2..9998bb5 100644
--- a/functions.py
+++ b/functions.py
@@ -89,3 +89,58 @@ def display(self):
 stu.setAge(10)
 stu.setMarks(90)
 stu.display()
+
+#filter function
+def fun1(a):
+    return a%2==0
+l=[2,5,6,23,34,68,12]
+f1=filter(fun1,l)
+print(f1,type(f1))
+print(list(f1))#we can make use of filter only once
+l1=list(f1)
+print(l1)#we will get null
+
+#lambda function
+v4=lambda x:x%2==0
+f2=filter(f4,l)
+for i in f2:
+    print(i)
+
+def fun1(a):
+    return a**3
+print()
+print(fun1(3))
+print(fun1(5))
+v2=lambda x,y:x+y
+print()
+print(v2(2,7))
+
+v3=lambda x,y:x if x>y else y
+print()
+print(v3(4,8))
+print(v3(6,3))
+
+#map function
+l=[1,2,3,4,5,6,7]
+def fun2(a):
+    return a*a
+
+m1=map(fun2,l)
+print(list(m1),type(m1))
+
+v=lambda x:x*x
+m2=map(v5,l)
+print(m2,list(m2),type(m1))
+#reduce function
+#reduces the sequence of elements into a single value
+#reduce will be imported from functools
+from functools import *
+l=[1,2,3,4,5,6,7]
+def fun3(a,b):
+    return a+b
+r3= reduce(fun3,l)
+print(r3)
+
+v6=lambda x,y:x+y
+r4=reduce(v6,l)
+print(r4)