While reviewing my code using jslint, I noticed a warning regarding the increment operator:
var x = 1;
x++;
Warning: Unexpected expression '++' in statement position.
According to the documentation:
"They are second only to faulty architecture in enabling viruses and other security threats."
How exactly can viruses exploit this?
I would appreciate an explanation of why this coding practice is considered bad and what potential consequences it may bring.
It's a bit unclear why you're having trouble accessing the documentation, but here is some information for you:
++ and --
The ++ increment and -- decrement operators have been known to contribute to poor code quality by encouraging unnecessary complexity. These operators can be problematic when it comes to security, as they are prone to errors that are hard to detect and fix. It is recommended to use other methods to add 1 to a variable, such as += and -=.
Avoid using these operators and stick to += and -= instead.
UPDATE: In case the original question has changed, here is an answer to the new one:
The main point of the quoted text is that making a mistake with postincrement can lead to security vulnerabilities that could be exploited by viruses. Consider this pseudo-nodejs code snippet that takes user input and writes to a database:
arguments = array('sql'=>'query');
i=0;
if (arguments[i]=='sql' and arguments[i++] does not contain drop table)
exec db query arguments[i];
if (arguments[i]=='file' and arguments[i++] is not executable js/php)
save content of arguments[i] as file on disk, so it can be executed
This small mistake in postincrement can result in significant security risks.
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