FAQs on the exercise Combining all Three Higher-Order Functions
There are currently no frequently asked questions associated with this exercise – that’s where you come in! You can contribute to this section by offering your own questions, answers, or clarifications on this exercise. Ask or answer a question by clicking reply () below.
If you’ve had an “aha” moment about the concepts, formatting, syntax, or anything else with this exercise, consider sharing those insights! Teaching others and answering their questions is one of the best ways to learn and stay sharp.
Join the Discussion. Help a fellow learner on their journey.
Ask or answer a question about this exercise by clicking reply () below!
You can also find further discussion and get answers to your questions over in Language Help.
Agree with a comment or answer? Like () to up-vote the contribution!
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?
There’s no reason function patterns have to start with reduce(), or go in any order for that matter. That’s just how these exercises are (maybe CC should add an exercise with another pattern).
You have to think about what the problem is asking for, not just fill it in as before. So for checkpoint 2: “find all numbers less than 10, add five to them, and find their total product”. This means filter (for less than 10), map (add 5 to each), then reduce (multiply all those together). Which means reduce(λ, map(λ, filter(λ, list))). Okay, turns out that’s a bad example since it’s the same order yet again (they really do need another exercise). But point is the order is case-by-case.
Correction (can’t seem to edit without deleting entirely): There actually is a good reason reduce is the last operation in these. It returns one value instead of an iterable, and these three are iterable functions.
) below.
) to up-vote the contribution!