weekday

function weekday(day, locale = 'es') { if (day > 7 || day < 1) throw new Error('Wrong day') return new Date(1970, 1, day).toLocaleString(locale, {weekday: 'long'}) } console.log(weekday(1)) // "domingo" console.log(weekday(2)) // "lunes" //... console.log(weekday(7)) // "sábado" // Otros idiomas: console.log(weekday(1, 'en')) // "Sunday" console.log(weekday(1, 'it')) // "domenica"