Highcharter/Highmap: change legend label format for billions

Question

I would like to change the label format of the legend in a highcharter map. I have values ranging from 0 to 200 billion. The first steps, ie thousand (k) and million (M), are fine, but I need to change the abbreviation for billion "G".

I am not really good in javascript, hence I dont know how to write the format-command in the hc_legend() function to change the "G" to a "B", while leaving "k" for thousand and "M" for million.

Here is a small example where one can see that highcharter uses "G" for billions.

library(highcharter)

df = data.frame(
  Country = c("AT","BE","CH","DE","FR","IT"),
  variable = rnorm(n = 6, mean = 120000000000, sd = 20000000000)
)


hcmap(map = "custom/europe",
      data = df, joinBy = c("hc-a2", "Country"), value = "variable", name = "variable",
      dataLabels = list(enabled = TRUE, format = '{point.name}'),
      borderColor = "#FAFAFA", borderWidth = 0.1,
      tooltip = list(valueDecimals = 0, valuePrefix = "€", valueSuffix = "")) %>%
  hc_mapNavigation(enabled = TRUE)
  #hc_legend(enabled = TRUE, format = "{value}B") #basically a placeholder, as I dont know how to proceed

Answer 1

Changing the 'G' to 'B' has to be done as follows:

hcoptslang <- getOption("highcharter.lang")
hcoptslang$numericSymbols <-c( "k", "M", "B" ,"T", "P" ,"E")
options(highcharter.lang = hcoptslang)

By that you change the numberic Symbols for highcharter.

PS: Thanks to @wergeld and @Roman Luštrik for their directions.