New to programming, variables/array

Question

  function A(a, b) {
     return a[b] * b;
   }
  function B(a) {

     var x = 0;
     for (var i=5; i>0; i--)
     x += A(a, i);

     return x;
  }
      var aValues = [3,5,9,8,7,1];
      var y = B(aValues);

Would the answer be: B(1) B(3) B(5) B(7) B(8) B(9) ? Im lost be any push in the right direction would be appreciated.

I'm guessing this is Javascript? And by answer, do you mean the value of y? Because if that was the case, y should just be an integer... — John
– John, Commented Dec 15, 2012 at 20:32
i think it is javascript and i think the answer is 80, I got some help, it should be a=aValues and B is i. So it would work out as 1*5 x=5, then 4*7 then x=5+28, 3*8 then x=33+24, 2*9 then x=57+18, 1*5 then x=75+5, x=80 so var y=80? Im sorry for the lack of information given. — Anthony
– Anthony, Commented Dec 16, 2012 at 1:47

micha · Accepted Answer · 2012-12-15 20:39:56Z

3

After the execution y is 80. The complete array is passed to B(). The loop in B() iterates over the last 5 elements of aValues. Arrays in Javascript start at index 0, so the loop i=5; i>0; i-- never touches the array element with index 0

Function a() then multiplies the current item with the current index and returns the result (which is added to x)

So for every loop index you get:

i=5 -> x += 1 * 5
i=4 -> x += 7 * 4
i=3 -> x += 8 * 3
i=2 -> x += 9 * 2
i=1 -> x += 5 * 1

So after the loop x contains the value 80 which is returned and assigned to y

answered Dec 15, 2012 at 20:39

micha

49.8k16 gold badges75 silver badges80 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Anthony Over a year ago

Thank you for the help. That was the explanation I needed.

Collectives™ on Stack Overflow

New to programming, variables/array

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related