# map function

By using map we can apply function to each item of any iterable
``map(function,iterable)``
function can be built in or user defined
iterable can be list, tuple , set etc.

## Using built-in function

String function len returns length of a string.
``````my_list=['Alex','Ronald','John']
my_list1=map(len,my_list) # using built in function len
print(list(my_list1))``````
Output
``[4, 6, 4]``

## Using user defined function

``````MATH=[20,30,40]
def my_function(n):
return n+5
my_list1=map(my_function,MATH)
print(list(my_list1))``````
Output
``[25, 35, 45]``

## Using Multiple iterators

We can get sum of three subjects
``````MATH=[20,30,40]
ENGLISH=[30,40,50]
SCIENCE=[40,50,60]
def my_function(a,b,c):
return a+b+c
my_list1=map(my_function,MATH,ENGLISH,SCIENCE)
print(list(my_list1))``````
Output
``[90, 120, 150]``

## Creating string from list

Here before using join() we can convert all elements to string by using str. We will apply map() to all elements to convert them to string.
``````my_list=['You','have','to','pass','in',3,'languages']
my_str = ' #'.join(map(str,my_list)) # from list create string
print(my_str)``````

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