lesson- 4, withdrawl function

[TimeKeyRoll]

Hey! I understand how "for" loop and "call" function works. but what i don't understand is why we are using "for" loop before "call" function. should it not be after the "call" function. i mean we want it to be on zero when we withdrawal. right? but its making it to zero before "call" function is executed. could please anyone explain me in easy and lay man language why we are using "for" loop before the "call" function and and how come it is making its value in zero.
thankyou very much.

[TimeKeyRoll]

Thanks 'shiv'. So it means Patrick had the mistakes there?

[technophile-04]

Hii sorry my bad, Actually it doesn't matter if you write above or below it because if the call function fails, and since we have added require call success which means if the function fails the whole state is reverted and nothing changes if it fails. Hope you get it

[TimeKeyRoll]

I get it but your two statements has made me confused. Lol thanks tho.

[technophile-04]

Take it as if the require statement fails the whole transaction is reverted which means any changes to the state will be undone and will revert to the state before failing. Hence for loop will be only effective if our call function returns true. It doesn't matter if you write below call function or above call because since both are independent and second if call fails the work done by for loop is reverted, It is ideally good if you write for loop below call.Even Patrick will talk about transaction getting reverted in further lessons

[TimeKeyRoll]

Perfect. Thanks man. APPRECIATED