champion-league-winners.js

function countWins(winnerList, country) {
    // your awesome code here
    var contador = 0
    winnerList.forEach(item => {
        if (item.country == country)
            contador = contador + 1;
    })
    return contador
}

/**
 * Usando el método 'filter' https://www.w3schools.com/jsref/jsref_filter.asp
 * 
 * function countWins(winnerList, country) {
  // your awesome code here
  
  let filtered =  winnerList.filter(match => {
    return match.country==country
  })

  return filtered.length
}
 */

const winnerList1 = [
    { season: '1996–97', team: 'Borussia Dortmund', country: 'Germany' },
    { season: '1997–98', team: 'Real Madrid', country: 'Spain' },
    { season: '1998–99', team: 'Manchester United', country: 'England' },
    { season: '1999–00', team: 'Real Madrid', country: 'Spain' },
    { season: '2000–01', team: 'Bayern Munich', country: 'Germany' },
    { season: '2001–02', team: 'Real Madrid', country: 'Spain' },
    { season: '2002–03', team: 'Milan', country: 'Italy' },
    { season: '2003–04', team: 'Porto', country: 'Portugal' },
    { season: '2004–05', team: 'Liverpool', country: 'England' },
    { season: '2005–06', team: 'Barcelona', country: 'Spain' },
    { season: '2006–07', team: 'Milan', country: 'Italy' },
    { season: '2007–08', team: 'Manchester United', country: 'England' },
    { season: '2008–09', team: 'Barcelona', country: 'Spain' },
    { season: '2009–10', team: 'Internazionale', country: 'Italy' },
    { season: '2010–11', team: 'Barcelona', country: 'Spain' },
    { season: '2011–12', team: 'Chelsea', country: 'England' },
    { season: '2012–13', team: 'Bayern', country: 'Germany' },
    { season: '2013–14', team: 'Real Madrid', country: 'Spain' },
    { season: '2014–15', team: 'Barcelona', country: 'Spain' },
    { season: '2015–16', team: 'Real Madrid', country: 'Spain' }
  ];

console.log(countWins(winnerList1, 'Portugal')) // Must be 1