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How do I get out of a screen without typing 'exit'?
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ephemientephemient
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R - Concatenate two dataframes?
...answered Dec 3 '11 at 2:39
dfrankowdfrankow
15.2k3535 gold badges115115 silver badges170170 bronze badges
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Ruby on Rails console is hanging when loading
...nd Ruby on Rails have no issue. When I finally Ctrl + C I get this stack trace, which points to Spring.
4 Answers
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How to compare strings ignoring the case
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You're looking for casecmp. It returns 0 if two strings are equal, case-insensitively.
str1.casecmp(str2) == 0
"Apple".casecmp("APPLE") == 0
#=> true
Alternatively, you can convert both strings to lower case (str.downcase) and c...
What is a non-capturing group in regular expressions?
...to explain this with an example.
Consider the following text:
http://stackoverflow.com/
https://stackoverflow.com/questions/tagged/regex
Now, if I apply the regex below over it...
(https?|ftp)://([^/\r\n]+)(/[^\r\n]*)?
... I would get the following result:
Match "http://stackoverflow.com/"
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Why is using “for…in” for array iteration a bad idea?
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5
*/
Also consider that JavaScript libraries might do things like this, which will affect any array you create:
// Somewhere deep in your JavaScript library...
Array.prototype.foo = 1;
// Now you have no idea what the below code will do.
var a = [1, 2, 3, 4, 5];
for (var x in ...
PHP 5: const vs static
...s, static variables are on the class scope (not the object) scope, but unlike a const, their values can be changed.
class ClassName {
static $my_var = 10; /* defaults to public unless otherwise specified */
const MY_CONST = 5;
}
echo ClassName::$my_var; // returns 10
echo ClassName::MY_C...
How to set HTTP headers (for cache-control)?
...or my site? Do I just put cache-control:public somewhere up in my header like this?
8 Answers
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Big O of JavaScript arrays
...cript are very easy to modify by adding and removing items. It somewhat masks the fact that most languages arrays are fixed-size, and require complex operations to resize. It seems that JavaScript makes it easy to write poorly performing array code. This leads to the question:
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What are differences between AssemblyVersion, AssemblyFileVersion and AssemblyInformationalVersion?
There are three assembly version attributes. What are differences? Is it ok if I use AssemblyVersion and ignore the rest?
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