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vec_seq_along() is equivalent to seq_along() but uses size, not length.
vec_init_along() creates a vector of missing values with size matching
an existing object.
vec_seq_along(x)vec_init_along(x, y = x)
vec_seq_along() an integer vector with the same size as x.
vec_init_along() a vector with the same type as x and the same size
as y.
Vectors
vec_seq_along(mtcars)
vec_init_along(head(mtcars))
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