[r] Extract the maximum value within each group in a dataframe

I have a data frame with a grouping variable ("Gene") and a value variable ("Value"):

Gene   Value
A      12
A      10
B      3
B      5
B      6
C      1
D      3
D      4

For each level of my grouping variable, I wish to extract the maximum value. The result should thus be a data frame with one row per level of the grouping variable:

Gene   Value
A      12
B      6
C      1
D      4

Could aggregate do the trick?

Using sqldf and standard sql to get the maximum values grouped by another variable

https://cran.r-project.org/web/packages/sqldf/sqldf.pdf

library(sqldf)
sqldf("select max(Value),Gene from df1 group by Gene")

or

Using the excellent Hmisc package for a groupby application of function (max) https://www.rdocumentation.org/packages/Hmisc/versions/4.0-3/topics/summarize

library(Hmisc)
summarize(df1$Value,df1$Gene,max)

df$Gene <- as.factor(df$Gene)
do.call(rbind, lapply(split(df,df$Gene), function(x) {return(x[which.max(x$Value),])}))

Just using base R