How to change the Y axis limit for boxplot created by using ggplot2 in R?

One of the most important aspects of a boxplot is Y-axis labels because these labels help us to understand the limit of the variable. Since R generate these labels automatically in a good way, we stick with that but we can change that using coord_cartesian function with ylim as shown in the below example.

Example

ggplot(df,aes(x,y))+geom_boxplot()+coord_cartesian(ylim=c(290,400))

Output