Google apps script - variable reset during iteration

Question

I would expect global variable iii to increment but iii remains = 1 throughout until max stack size reached.

var iii = 1; //this is supposed to be global variable declaration in google apps script

function tryglobal() {
  for (iii = 1; iii < 100; iii++)  {
    console.log(iii);
    iii = iii*2;
    tryglobal();
  }
}

but iii always remain 1 till stack overflow in google apps script.

Why so? Is it due to processing of each iteration seperately?

Answer 1

Issue:

The for-loop initialization expression resets iii to 1 on each recursion

/*<ignore>*/console.config({maximize:false,timeStamps:false,autoScroll:false});/*</ignore>*/
var iii=1; //this is supposed to be global variable declaration in google apps script

function tryglobal() 
{
for (iii=1;iii<100;iii++) 
  {console.log(iii);
  iii=iii*2;
  tryglobal();
  }
}
tryglobal()

<!-- https://meta.stackoverflow.com/a/375985/ -->    <script src="https://gh-canon.github.io/stack-snippet-console/console.min.js"></script>

Solution:

Avoid resetting iii to 1 in for() loop initializer

/*<ignore>*/console.config({maximize:false,timeStamps:false,autoScroll:false});/*</ignore>*/
var iii=1; //this is supposed to be global variable declaration in google apps script

function tryglobal() 
{
for (;iii<100;iii++) 
  {console.log(iii);
  iii=iii*2;
  tryglobal();
  }
}
tryglobal()

<!-- https://meta.stackoverflow.com/a/375985/ -->    <script src="https://gh-canon.github.io/stack-snippet-console/console.min.js"></script>

References:

• For loop