大约有 641 项符合查询结果（耗时：0.0063秒） [XML]
“for” vs “each” in Ruby
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See "The Evils of the For Loop" for a good explanation (there's one small difference considering variable scoping).
Using each is considered more idiomatic use of Ruby.
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How to get a variable value if variable name is stored as string?
...y cause harm through code injection.
For example
Y="\`touch /tmp/eval-is-evil\`"
would create /tmp/eval-is-evil. This could also be some rm -rf /, of course.
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How does this site infecting script work?
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It removes most of the special characters, turning it into a normal URL:
evil://dyndns-org.gamestop.com.mybestyouxi-cn.genuinehollywood.ru:8080/softonic.com/softonic.com/google.com/livejasmin.com/videosz.com/
(I manually changed http: to evil:)
Note that the regex could have been simplified to ...
Convert string to Python class object?
... Eval does not leave the door open to anything. If you have malicious, evil users who might maliciously and evilly pass bad values to eval, they can just edit the python source. Since they can just edit the python source, the door is, was, and always will be open.
– S.Lott
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Is there a way to access method arguments in Ruby?
...s (arguments). Thanks to that you can improve the accepted answer to avoid evil eval.
def foo(x, y)
method(__method__).parameters.map do |_, name|
binding.local_variable_get(name)
end
end
foo(1, 2) # => 1, 2
s...
jQuery/JavaScript: accessing contents of an iframe
...wer is not a solution for him.
– ANeves thinks SE is evil
Nov 4 '11 at 13:38
3
@fizzbuzz Then you...
Am I immoral for using a variable name that differs from its type only by case?
... data types.
Person person = new Person(); // okay
int Int = 42; // pure evil
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String to object in JS
...console.log(obj.path); // will print /img/filename.jpg
REMEMBER: eval is evil! :D
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Clean way to launch the web browser from shell script?
...dized and should be available in most distributions.
Otherwise:
eval is evil, don't use it.
Quote your variables.
Use the correct test operators in the correct way.
Here is an example:
#!/bin/bash
if which xdg-open > /dev/null
then
xdg-open URL
elif which gnome-open > /dev/null
then
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Evaluating a mathematical expression in a string
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eval is evil
eval("__import__('os').remove('important file')") # arbitrary commands
eval("9**9**9**9**9**9**9**9", {'__builtins__': None}) # CPU, memory
Note: even if you use set __builtins__ to None it still might be possible to ...