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package util
import "fmt"
// Formats a positive number into a string with _ between each three-group of
// digits, for numbers >= 10_000.
//
// Regarding the >= 10_000 exception:
// https://en.wikipedia.org/wiki/Decimal_separator#Exceptions_to_digit_grouping
func FormatInt(i int) string {
if i < 10_000 {
return fmt.Sprint(i)
}
result := ""
chars := []rune(fmt.Sprint(i))
addCount := 0
for i := len(chars) - 1; i >= 0; i-- {
char := chars[i]
if len(result) > 0 && addCount%3 == 0 {
result = "_" + result
}
result = string(char) + result
addCount++
}
return result
}
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