For the Medium post "Find the first day of the week with Go"

example.go

package main

import (
    "github.com/noamt/go-cldr/supplemental"
    "golang.org/x/text/language"
)

func main() {
    tag, _ := language.Parse("en-US")
    region, _ := tag.Region()
    weekDay := supplemental.FirstDay.ByRegion(region)
    println("First day is", weekDay)
}