//#1
function printTimeout(str, n){
  setTimeout(function() {
  console.log(str);
},n*1000);
}
printTimeout('Hello', 10);

//#2
function sumAll(n) {
  return n == 1? n : n + sumAll(n-1);
}
console.log(sumAll(2));
console.log(sumAll(4));

//#3
function bombTimer(str, time){
  let i = setInterval (function () {
      if (time >= 1){
        console.log(time--);
      }else{
        console.log(str);
        clearInterval(i);
      }
    },1000);
}
bombTimer('Booom', 3);

//#4
function factorial(n) {
  return n == 1 ? n : n * factorial(n-1);
}
console.log(factorial(3));
console.log(factorial(5));

//#5
function bombTimer(str, time){
  setTimeout(function lime() {
        if (time >= 1){
          console.log(time--);
          setTimeout(lime,1000);
        }else{
          console.log(str);
        }
    },0);
}
bombTimer('Booom', 3);

//#6
function filterNumbers(arr, maxNumber) {
  let filteredArr = [];
  for (let i = 0; i < arr.length; i++){
      if (arr[i] <= maxNumber){
        filteredArr.push(arr[i]);
      }
    }
  return filteredArr;
  }
console.log(filterNumbers([1, 4, 8, 1, 20], 5));

//#7
function minMax(arr){
  return 'max: ' + Math.max(...arr) + ' min: ' + Math.min(...arr);
}
console.log(minMax([1, 4, 8, 2, 20]));

#8
function arrAvg(arr) {
  return arr.reduce((a,b) => a+b, 0)/arr.length;
}
console.log(arrAvg([1,4,2]));

//#9
function concatFirstNestedArrays(arr){
  let joinArr = [].concat.apply([], arr);
  return joinArr;
}
console.log(concatFirstNestedArrays([[0, 1], [2, 3], [4, 5]]));

//#10
function usersToObject(users){
  let newObject = {};
  for(i=0; i < users.length; i++){
    newObject[users[i]['id']] = users[i];
  }
  return newObject;
}
const users = [
  { id: 1, name: 'John', birthday: '1999-2-12'},
  { id: 2, name: 'Bill', birthday: '1999-1-19'},
  { id: 3, name: 'Carol', birthday: '1999-1-11'},
  { id: 4, name: 'Luce', birthday: '1999-2-22'}
]
console.log(usersToObject(users));

//#11
function filterUsersByMonth(users, month){
  return users.filter(function(elem){
    if ((elem['birthday'].split('-'))[1] == month){
      return true;
    }else{
      return false;
    }
  });
}
const users = [
    { name: 'John', birthday: '1999-2-12' },
    { name: 'Bill', birthday: '1999-1-19' },
    { name: 'Carol', birthday: '1999-0-11' },
    { name: 'Luce', birthday: '1999-2-22' }
  ]
console.log(filterUsersByMonth(users, 0));

//#12
function getAdultNames(users) {
  let adultNames = [];
  for (i = 0; i < users.length; i++){
    let age = new Date().getFullYear() - new Date(users[i].birthday).getFullYear();
    if(age>=18){
      users[i].birthday = age;
      adultNames.push(Object.values(users[i]).join(' '));
    }
  }
  return adultNames.join(', ');
}
const users = [
  { name: 'John', birthday: '1999-6-12' },
  { name: 'Bill', birthday: '2005-5-19' },
  { name: 'Carol', birthday: '2003-10-11' },
  { name: 'Luce', birthday: '2000-11-22' }
];
console.log(getAdultNames(users));