While putting the
aes function inside a geom changes its behavior from local to global, putting it outside both geoms and
ggplot() seems to have the same effect as putting it inside `ggplot(). This means that code that I usually see written as:
ggplot(gapminder, aes(x = year, y = lifeExp, color = continent, size = pop)) + geom_line(stat = 'summary', fun = mean)
could be written as
ggplot(gapminder) + aes(x = year, y = lifeExp, color = continent, size = pop) + geom_line(stat = 'summary', fun = mean)
Which I personally find visually tidier, easier to manipulate, and avoids the function within function situation which can lead to missed closing double parenthesis at the end.
Both approaches change the global aesthetics but I want to double check if they are truly equivalent so that they can be used interchangeably, or if there are some corner cases when using the latter approach?