Mod 11 Javsscript

mod11.js

//https://es.wikipedia.org/wiki/C%C3%B3digo_de_control
const mod11 = (text: string) => {
    const items = text.split("").reverse()
    let weigHing = 2
    let acum = 0
    items.forEach((item: string): void => {
      acum += Number.parseInt(item) * weigHing
      weigHing = weigHing == 7 ? 2 : weigHing + 1
    })
    const mod = acum % 11
    const checkDigit = 11 - mod

    if (checkDigit == 10) return "K" //Chile 🇨🇱
    if (checkDigit == 11) return 0

    return checkDigit
  }