To print a number with thousands separator in Go, you can use the Printer object from the official golang.org/x/text/message package. Its job is to translate text strings from one language to another, and it also allows you to print numbers in a language-specific format.
More specifically, the
message.Printerobject allows a number to be formatted using the Unicode CLDR.
package main
import (
"fmt"
"golang.org/x/text/language"
"golang.org/x/text/message"
)
func main() {
number := 1_000_000.23456
p := message.NewPrinter(language.English)
withCommaThousandSep := p.Sprintf("%f", number)
fmt.Println(withCommaThousandSep)
}
Output:
1,000,000.234560
In standard English format, the comma is the thousands separator, and the point is the decimal separator. However, you can format the number in any language format:
package main
import (
"fmt"
"golang.org/x/text/language"
"golang.org/x/text/message"
)
func main() {
number := 1_000_000.23456
langs := []language.Tag{
language.German,
language.Ukrainian,
language.Chinese,
language.Arabic,
language.French,
}
for _, l := range langs {
p := message.NewPrinter(l)
withCommaThousandSep := p.Sprintf("%s %f", l, number)
fmt.Println(withCommaThousandSep)
}
}
Output:
de 1.000.000,234560
uk 1 000 000,234560
zh 1,000,000.234560
ar ١٬٠٠٠٬٠٠٠٫٢٣٤٥٦٠
fr 1 000 000,234560
