2.4 rince and repeat, with for

this is the 2.2 

var value = 2;
for (var power = 0; power <10; power++) {
   value = 2 * value; show (value); }

this is the 2.3

var chain = "#";

for (var cont = 0; cont <10; cont++) {

  print (chain); chain = chain +"#"; }