Перебор массива в js

let teams = [{ 
  Name: 'Vasa', 
  Age: 25 
}, { 
  Name: 'Alex', 
  Age: 20 
}, { 
  Name: 'Mark', 
  Age: 20 
}, { 
  Name: 'Clark', 
  Age: 22 
}] 
//---------------------------------------------------------------- 
 
 
function filterCountry(object, key) { 
  var arr1 = []; 
  key.forEach(function(item, i, arr) { 
 
    var result = object.filter(team => team.Age === item) 
    if (result.length == 1) 
      arr1.push(result[0]); 
    else { 
      for (let i of result) { 
        arr1.push(i); 
      } 
    } 
 
  }); 
 
  return arr1; 
} 
 
var result1 = filterCountry(teams, [25, 20]); 
 
console.log(result1);

let teams = [{ 
  Name: 'Vasa', 
  Age: 25 
}, { 
  Name: 'Alex', 
  Age: 20 
}, { 
  Name: 'Mark', 
  Age: 20 
}] 
 
 
function filterCountry(object, key) { 
  return object.filter(team => key.some(age => team.Age == age)); 
} 
var result1 = filterCountry(teams, [25, 20]); 
 
console.log(result1);