FAQ: Loops - For Each Loops

This community-built FAQ covers the “For Each Loops” exercise from the lesson “Loops”.

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Hi! I didn’t quite understand how the foreach loop repeated the instruction the number of times that was needed to complete the tile pattern in the exercise? I expected it to only repeat the instruction according to the number of items in the list.


" We only need to write placeTile() once because the pink-green-red repetition is already described in the list."

So… the repetition is defined by the input “festiveList = [‘pink’, ‘green’, ‘red’, ‘pink’, ‘green’, ‘red’ ]”?
So, if I were to just input “festiveList = [‘pink’, ‘green’, ‘red’]” once, it wouldn’t loop? I just don’t get why you need to type ‘pink’, ‘green’, ‘red’ twice.


I would like to second this question, can you please explain how the lists were written?
Also where is the code to run each of the different list?
There is only placeTile(color) but how do we know to make it festiveList or moodyList?



The exercise calls for ‘placeTile(color)’

Does this mean that ‘color’ has already been defined outside of this exercise (ie the backend)? If I were building this from scratch, would I have to define ‘color’ first, before it can be used?


Is this exercise an infinite loop ?
How does the computer knows when to stop ?

1 Like

Why is the “for each loop” a loop?

To me it is like asking the computer “do all this ONCE”. I do not see any loop in doing something only once.

i would also like to understand that part, it kinda bugs me to get half of the information. to fully understand this, i would need to at least get access to the code behind (i’m guessing it’s backend because i don’t know exactly what it is yet) to see how it works. if someone could explain this to us, it would be really appreciated.

Thank you!

i got a friend to explain me that the (color) has been defined in the “for each” before wich we don’t see because it’s not the point of this exercise and it could be confusing to give us that kind of information at this point.
feel free to answer my original question if you want to, so that it can help others, but i understand it now. Thank you!