FAQ: Functional Programming - Combining all Three Higher-Order Functions

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This community-built FAQ covers the “Combining all Three Higher-Order Functions” exercise from the lesson “Functional Programming”.

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This exercise can be found in the following Codecademy content:

[Beta] Learn Advanced Python 3

FAQs on the exercise Combining all Three Higher-Order Functions

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2

Hi there,
I’m having a difficult time to understand the order to apply in these higher functions.

first i thought the code was :

product = reduce(lambda x,y: x*y,  filter(lambda n: n < 10, map(lambda i: i+5, nums)))

output 3024

the exercise was not right, so i went to the solution, that was:

product = reduce(lambda x,y: x*y, map(lambda i: i+5, filter(lambda n: n < 10, nums)))

output 72648576

i understand the reduce always comes outside of all, but how can i know where to put the other two in the sequence?

thanks!

3

I have a similar question:

the order in all exercises was always reduce( map( filter()))
in exercise 8 it is reduce( filter( map())) with map() coming after filter() does the order of the higher-order functions matter, or not? I’ confused
just completed the exercise and the order in the two steps is contrary, first filter() than map(), than map() followed by filter(). is the first order particular when working with dictionaries?