Partion of a vector to a list

Question

Let v be a vector as follows:

> v <- seq_len(90) 
> v
[1] 1 2 3 4 5 6 7 8 9,.....

For any number,e.g. 3, How to get a list as follows;

>foo(v,3)

[[1]]
[1] 1 2 3

[[2]]
[1] 4 5 6

[[3]]
[1] 7 8 9

    ......

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