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Why is using the JavaScript eval function a bad idea?
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Improper use of eval opens up your
code for injection attacks
Debugging can be more challenging
(no line numbers, etc.)
eval'd code executes slower (no opportunity to compile/cache eval'd code)
Edit: As @Jeff Walden points out in comments, #3 is less true today than it was in 2008....
Rethrowing exceptions in Java without losing the stack trace
...se the throw; statement to rethrow an exception while preserving the stack trace:
9 Answers
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Is there any difference between “foo is None” and “foo == None”?
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BrendanBrendan
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convert a list of objects from one type to another using lambda expression
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JaredParJaredPar
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Java array reflection: isArray vs. instanceof
...you test an object's type before downcasting to a particular type which is known at compile time. For example, perhaps you wrote some code that can work with a Integer[] or an int[]. You'd want to guard your casts with instanceof:
if (obj instanceof Integer[]) {
Integer[] array = (Integer[]) ob...
How to get pixel data from a UIImage (Cocoa Touch) or CGImage (Core Graphics)?
...coa Touch). From that, I'm happy to get a CGImage or anything else you'd like that's available. I'd like to write this function:
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Keeping ASP.NET Session Open / Alive
Which is the easiest and most unobstrusive way to keep an ASP.NET session alive as long as the user has the browser window open? Is it timed AJAX calls? I want to prevent the following: sometimes users keep their window open for a long time, then enter stuff, and on submit nothing works anymore beca...
How should equals and hashcode be implemented when using JPA and Hibernate
...lementation good enough for most cases? Is there any sense to use business keys?
8 Answers
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Java lib or app to convert CSV to XML file? [closed]
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CloudyMarble
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answered Aug 1 '08 at 18:51
svristsvrist
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Which comment style should I use in batch files?
...supported way to embed comments in batch files.
:: is essentially a blank label that can never be jumped to, whereas REM is an actual command that just does nothing. In neither case (at least on Windows 7) does the presence of redirection operators cause a problem.
However, :: is known to misbeh...