Functional programming
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# separation pf concern
# clear and understandable
# easy to extend
# easy to maintain
# memory efficient
# DRY
# pure function
# 1. given the same input and return the same result
# 2. produces no side effect
def multiply_by_two(li):
new_list = []
for i in li:
new_list.append(i*2)
return new_list
print(multiply_by_two([1,2,3]))
# if the function returns print() then it is not pure function
Python
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