Question: Using R code with stringr installed how do Replace all empty strings (i.e. ) with NA in the status column of a data frame. The

Using R code with stringr installed how do Replace all empty strings (i.e. "") with NA in the status column of a data frame.

The hint given is as follows:

> social_df$status[social_df$status == ___] <- ___

My wrong answer is:

> social_df$status[social_df$status == ""] <- str_replace(social_df$status, "", "NA")

However, the following error statements are returned: Error: Empty `pattern` not supported

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