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I have an array which contains arrays of objects, that resembles this:

[{a:1}, {a:2}, {a:3}], [{b:1}, {b:2}], [{c:1}, {c:2}]

I don't know how many arrays there will be or how many objects inside them.

What I want to do is extract each object from the arrays and push them into a new array of objects where there is every possible combination of object, like this:

[
  { a:1, b:1, c:1 },
  { a:1, b:1, c:2 },
  { a:1, b:2, c:1 },
  { a:1, b:2, c:2 },
  { a:2, b:1, c:1 },
  { a:2, b:1, c:2 },
  { a:2, b:2, c:1 },
  { a:2, b:2, c:2 },
  { a:3, b:1, c:1 },
  { a:3, b:1, c:2 },
  { a:3, b:2, c:1 },
  { a:3, b:2, c:2 }
]

I've started to consider that the method might be to get the value from the a:1 object, and then loop over the others, but I'm wondering if there's an efficient pattern to solve this restructuring?

Improve this question
6
  • If I understand correctly, you're trying to do what a nested for loop would normally do, but you don''t know the depth ahead of time? If so, consider using a counter variable and do division and mod operations on it. Commented Aug 11, 2022 at 14:51
  • I'm now actually wondering if I could just flatten out the depth first and then nest some for loops? Commented Aug 11, 2022 at 14:57
  • 1
    The problem is you don't know how many for loops in advance, even with flattening (unless I'm missing something). I'm willing to bet someone's written a function to do this, so, unless you're doing this to learn, google might help Commented Aug 11, 2022 at 14:58
  • stackoverflow.com/questions/32634796/… provides a recursive solution, though I personally am opposed to recursive functions in general, since they can fail if you ... do exactly what this site is named. Commented Aug 11, 2022 at 15:04
  • 1
    I think this actually solves it perfectly: stackoverflow.com/questions/12303989/… Commented Aug 11, 2022 at 16:21
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