Nuclear bombs per continent
Since WWII, a number of nations have been detonating nuclear bombs for military research. A tally of bombs detonated per nation has been calculated from the Nuclear Explosion DataBase (NEDB) and provided as nuke_df. You are interested in finding out how many bombs have been detonated by nations grouped per continent. To achieve this goal, nuke_df will be joined to country_to_continent_df which is a mapping of nation to continent. You will need to overwrite missing values with zeros so that you can create a nice plot.
The dplyr and ggplot2 packages have been pre-loaded for you.
Side note 1: Bombs detonated by the Soviet Union were attributed to the Russian Federation.
Side note 2: The Russian Federation is solely mapped to Europe for simplicity.
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Reshaping Data with tidyr
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country_to_continent_df %>%
left_join(nuke_df, by = "country_code") %>%
# Impute the missing values in the n_bombs column with 0L
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