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HTML table with fixed headers?
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@tetra td { max-width: 30px; } this will allow you the developer to control how the rows are displayed.
– Lyuben Todorov
May 30 '12 at 22:28
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Common elements in two lists
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Use Collection#retainAll().
listA.retainAll(listB);
// listA now contains only the elements which are also contained in listB.
If you want to avoid that changes are being affected in listA, then you need to create a new one.
List<Integer&g...
Facebook database design?
...nd table that holds the UserID and then the UserID of the friend (we will call it FriendID). Both columns would be foreign keys back to the Users table.
Somewhat useful example:
Table Name: User
Columns:
UserID PK
EmailAddress
Password
Gender
DOB
Location
TableName: Friend...
Accessing last x characters of a string in Bash
... line:
$ foo=1234567890
$ echo $foo | grep -o ...$
890
To make it optionally get the 1 to 3 last chars, in case of strings with less than 3 chars, you can use egrep with this regex:
$ echo a | egrep -o '.{1,3}$'
a
$ echo ab | egrep -o '.{1,3}$'
ab
$ echo abc | egrep -o '.{1,3}$'
abc
$ echo abcd ...
Any way to declare a size/partial border to a box?
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Not really. But it's very easy to achieve the effect in a way that degrades gracefully and requires no superfluous markup:
div {
width: 350px;
height: 100px;
background: lightgray;
position: relative;
margin: 20...
iPhone - Grand Central Dispatch main thread
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Dispatching a block to the main queue is usually done from a background queue to signal that some background processing has finished e.g.
- (void)doCalculation
{
//you can use any string instead "com.mycompany.myqueue"
dispatch_queue_t backgroundQueue = dispat...
What is the purpose of the “final” keyword in C++11 for functions?
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@AaronMcDaid: Compilers usually warn about code that, being correct, might cause confusion or errors. I have never seen anyone surprised by this particular feature of the language in a way that could cause any problem, so I don't really know how useful...
How to create a new database using SQLAlchemy?
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On postgres, three databases are normally present by default. If you are able to connect as a superuser (eg, the postgres role), then you can connect to the postgres or template1 databases. The default pg_hba.conf permits only the unix user named postgres to u...
Cleanest way to write retry logic?
Occasionally I have a need to retry an operation several times before giving up. My code is like:
29 Answers
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Is there a difference between /\s/g and /\s+/g?
...eans "one or more spaces".
But, because you're using the /g flag (replace all occurrences) and replacing with the empty string, your two expressions have the same effect.
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