Countdown Recursive

function countDown(number){
  if (number >= 0){
    console.log(number);
    number = number - 1;
    countDown(number);
  }  
}

countDown(5);

Dec 15 - Homework

Please see attached files: 

Factorial

function* factorialGenerator(){
var count = 1;
var list = [1];
while(true){
  var next = count * list[list.length-1];
  list.push(next);
  yield(next);
  count++;
  }
}

var factorial = factorialGenerator();

console.log(factorial.next().value);
console.log(factorial.next().value);
console.log(factorial.next().value);
console.log(factorial.next().value);

Fib Seq

function fib(number) {
    if (number === 0) {
        return 0;
    } else if (number === 1) {
        return 1;
    } else {
        return fib(number-1)+fib(number-2);
    }
}

function fibonacci(number){
  result = [];
  for(i=1; i <= number ; i++) { 
    result.push(fib(i));
  }
  return result;
}