What is the best way to do it in such cases?

Question

Programming

I'll give you an example. In some section of the code, the Nth amount needs to be withdrawn from the user account. Naturally, before withdrawing, you need to check if this amount is in his variable. So. In this situation, a couple more checks are added: is there an account, when did the account appear, etc. And most importantly, after any negative check of the score, you need to inform the user about it, and interrupt the code section.
And this section when (with checking the account and withdrawing the amount) needs to be duplicated in many places in the code, only the amounts are different.
If everything is entered into a function that takes the sum as an argument, then it is also an exit. But there is one BUT. If in the code section, before withdrawing the amount, we inform the user that they have withdrawn, and the next line will be a call to this function, which will find out that the user does not have such an amount, then it will not be entirely correct. In this case, using this approach, you should always consider calling this function in the first place in the code section.

Answer 1

And what is the problem? Take out to a function, the function returns true if the removal was definitely successful. All checks are in it ... And if true is returned, report that it has been removed.

Answer 2

$result = takeMoney(100);

if($result==='ok')
      echo "Удачно сняли деньги";
}elseif($result=='account_closed'){
      echo "Аккаунт закрыт";
}elseif($result=='money_wrong'){
      echo "Вы указали неправильную сумму";
}else{
 echo "Непредвиденная ошибка";
}

This is a head-on solution, no problem if.
takeMoney respectively returns error codes or 'ok' if ok
Example in php, but similar is written in any language.

Answer 3

To solve similar problems, the approach of Aspect-Oriented Programming (AOP) is used. You can read it
Here (wiki)
Here (habr)
Here (almost a book)
Support is provided using frameworks like AspectJ, Aspect#, Aspect.NET and a bunch of others.

Answer 4

You can use monads. And error logging will be security.