What is this block of code doing in laymans terms

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Could someone please explain this block of code line by line to me, or even better explain it by using more of a beginners code example.

const movies = useMemo(() => {
if (!filmWorld.Provider) return [];
return filmWorld.Movies.map((movie, index) => ({
...movie,
cinemaWorldPrice:
cinemaWorld.Provider && cinemaWorld.Movies[index]?.Price,
}));
}, [filmWorld, cinemaWorld]);

This is in React. The variables filmworld and cinemaworld are objects containing almost identical movie data.

Any help or explanation so I can understand this more clearly would be great.

What I have tried:

The code is functioning I'd just like more info line by line or a more basic version of the code so I can understand.

Posted 27-Apr-22 20:23pm

tobias bedford

Updated 27-Apr-22 21:36pm

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Richard MacCutchan 28-Apr-22 3:23am

If filmWorld.Provider is null then return an empty array, otherwise return a map of movie (presumably names), and their price.

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OriginalGriff · Answer 1 · 2022-04-27T21:36:00

Do you have any idea how much work explaining code line by line is?
Every single line needs a paragraph of explanation! For example:

int next = r.Next();

Create a new variable called "next" which can hold a integer value. From the previously declared Random instance "r", call the "Next" method to get a new random number, and assign it to the "next" variable.

Can you imagine how long it would take us to explain even a very short code fragment like your example, line by line?

No. It is not going to happen. If you have a specific problem, then ask a question about it. But think first - would you want to sit down for 45 minutes and type up a line-by-line description for no good reason?