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

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

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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!