Is the a way to generalize expand.grid

I was interested in looking at doing some computations for a bunch of variables whose values were all either 1 or 2.

I was trying to set this up with something like expand grid.

Ideally I could get 10+ columns (column names don't matter).

If I were to do this manually for 3 columns, it'd look something like

df <- expand.grid(a=1:2, b=1:2, c=1:2,)

but this somehow feels inelegant.

I tried using

df <- expand.grid(rep(1:2, 3))

But this produced a single column where the numbers 1 and 2 were repeated 3 times, instead of a grid.

Is there a way to get expand.grid to work with my input, or is there an easy way of doing what I'm asking for using another method?

Something like that?

do.call(expand.grid, list(a=1:2, b=1:2, c=1:2))

And if you want to auto-generate the list:

do.call(expand.grid, replicate(3, 1:2, simplify = FALSE))
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Perfect! Thanks so much for the prompt reply!