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To create a tooltip using code in ggplot and tidyverse, you need to use the ggplotly function from the plotly package. The following steps outline the process:

1. Load the required libraries:

library(ggplot2)
library(plotly)

1. Create the ggplot object and specify the aesthetic mappings:

p <- ggplot(data = mtcars, aes(x = mpg, y = wt)) +
  geom_point()

1. Convert the ggplot object to a plotly object using the ggplotly function:

p <- ggplotly(p)

1. Specify the tooltip information using the tooltip function:

p <- p %>% 
  layout(
    hoverlabel = list(
      namelength = -1
    ),
    tooltip = list(
      formatter = "function(variable, value) {
        if(variable === 'mpg') {
          return('Miles per gallon: ' + value);
        } else {
          return('Weight: ' + value);
        }
      }"
    )
  )

1. Customize the tooltip formatting by specifying the variables and formatting instructions inside the formatter function.

2. Display the plot:

p

The resulting plot will have a tooltip pop-up when you hover over each point, displaying the values of the mpg and wt variables.