Add Common Legend to Combined ggplot2 Plots in R

# Load ggplot2 and gridExtra
library("ggplot2") 
library("gridExtra")

# Create sample data
set.seed(5642)                             
sample_data <- data.frame(
  name = c("Geek1","Geek2","Geek3",
           "Geek4","Geeek5") ,
  value=c(31,12,15,28,45))


# Create both plot and store in variable
plot1<-ggplot(sample_data,
              aes(x = name, y = value, col=name)) +
              geom_point(size=4)
plot2<-ggplot(sample_data,
              aes(x = name, y = value, fill=name)) +
              geom_col()

# combine both plots using grid.arrange()
grid.arrange(plot1, plot2, ncol = 2)

# To remove legend
plot+ theme( legend.position = "none" ) 

# arrange side by side in a grid
grid.arrange( plot1 , plot2 , ncol=2) 

get_only_legend <- function(plot) {
  
# get tabular interpretation of plot
plot_table <- ggplot_gtable(ggplot_build(plot)) 
  
#  Mark only legend in plot
legend_plot <- which(sapply(plot_table$grobs, function(x) x$name) == "guide-box") 
                            
# extract legend
legend <- plot_table$grobs[[legend_plot]]
                            
# return legend
return(legend) 
}

grid.arrange(combined_plot, legend, nrow = 2, heights = c(10, 1))

# Create sample data
set.seed(5642)                             
sample_data <- data.frame(
  name = c("Geek1","Geek2","Geek3",
           "Geek4","Geeek5") ,
  value=c(31,12,15,28,45))

# Load ggplot2 and gridExtra
library("ggplot2") 
library("gridExtra")

# Create both plot and store in variable without legend
plot1<-ggplot(sample_data,
              aes(x = name, y = value, col=name)) +
              geom_point(size=4)+
              theme(legend.position = "none")
plot2<-ggplot(sample_data,
              aes(x = name, y = value, fill=name)) +
              geom_col()+
              theme(legend.position = "none")

# combine both plots using grid.arrange()
combined_plot <- grid.arrange(plot1, plot2, ncol = 2)

# plot1 with legend
plot1_legend <- ggplot(sample_data,
              aes(x = name, y = value, col=name)) +
              geom_point(size=4)+
              theme(legend.position = "bottom")

# function to extract legend from plot
get_only_legend <- function(plot) {
  plot_table <- ggplot_gtable(ggplot_build(plot))
  legend_plot <- which(sapply(plot_table$grobs, function(x) x$name) == "guide-box")
  legend <- plot_table$grobs[[legend_plot]]
  return(legend)
}
                          
# extract legend from plot1 using above function
legend <- get_only_legend(plot1_legend)   
   
# final combined plot with shared legend
grid.arrange(combined_plot, legend, nrow = 2, heights = c(10, 1))