Text format Rut Chile 🇨🇱

formatRutChile.js

// https://www.bci.cl/corporativo/banco-en-linea/personas
// https://www.nombrerutyfirma.com/nombre
const formatRut = (text: string) => {
    let f = text.split("").reverse()
    const fr1 = f.splice(0, 1).join("")
    const fr2 = f.splice(0, 3).join("")
    const fr3 = f.splice(0, 3).join("")
    const fr4 = f.splice(0, 3).join("")

    const te = (_text: string, caracter = ".") =>
      _text.length > 0 ? `${_text}${caracter}` : ""

    return `${te(fr1, "-")}${te(fr2)}${te(fr3)}${te(fr4)}`
      .split("")
      .slice(0, -1)
      .reverse()
      .join("")
  }