//Fibonacci

function fibonacci(n) {

  var array = [0, 1];

  for (var i = 2; i <= n; i++) {

    array.push(array[i - 1] + array[i - 2]);

  }

  return array[n];

}

var n = 6;

var ans = fibonacci(n);

console.log(ans);

function* idMaker() {

    var index = 0;

    while(true)

        yield index++;

}

var gen = idMaker(); // "Generator { }"

console.log(gen.next().value); //

console.log(gen.next().value); //

console.log(gen.next().value); //

// ...

function* fib() {

  var temp, num1 = 0, num2 = 1;

  while (1) {

    yield num1;

    temp = num1;

    num1 = num2;

    num2 += temp;

  }

}

// fibonacci generator function

var genFib = fib();

// Print the first ten numbers in the fibonacci sequence.

for (var arr = [], i = 0; i < 10; i++) {

  arr.push(genFib.next());

}

alert("1st 10 fibonacci sequence numbers:\n" + arr.join("\n"));