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How do I check if a string is a number (float)?
What is the best possible way to check if a string can be represented as a number in Python?
33 Answers
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Checking if output of a command contains a certain string in a shell script
...ipt, and I'm trying to check if the output of a command contains a certain string. I'm thinking I probably have to use grep, but I'm not sure how. Does anyone know?
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Can someone explain the traverse function in Haskell?
...user IDs to usernames looks like:
mapUserIDsToUsernames :: (Num -> IO String) -> [Num] -> IO [String]
mapUserIDsToUsernames fn ids = traverse fn ids
There's also a function called mapM:
mapM :: (Traversable t, Monad m) => (a -> m b) -> t a -> m (t b)
Any use of mapM can...
jQuery UI Sortable, then write order into a database
...t;/ul>
When you use the serialize option, it will create a POST query string like this: item[]=1&item[]=2 etc. So if you make use - for example - your database IDs in the id attribute, you can then simply iterate through the POSTed array and update the elements' positions accordingly.
For ...
What is the difference between ? and Object in Java generics?
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An instance of HashMap<String, String> matches Map<String, ?> but not Map<String, Object>. Say you want to write a method that accepts maps from Strings to anything: If you would write
public void foobar(Map<String, Object> ms...
Remove the first character of a string
I would like to remove the first character of a string.
4 Answers
4
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Calling C++ class methods via a function pointer
...ility with member pointers - Visual C++, at least in the past, needed some extra clues about how to represent member pointer types. I'd use the static function approach for an embedded system - the representation of a pointer is the same as any other function pointer, the costs are obvious, and ther...
C#: Looping through lines of multiline string
What is a good way to loop through each line of a multiline string without using much more memory (for example without splitting it into an array)?
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querySelector search immediate children
...an ID, and if not, they temporarily add an ID, then create a full selector string.
Basically you'd do:
var sel = '> someselector';
var hadId = true;
if( !elem.id ) {
hadID = false;
elem.id = 'some_unique_value';
}
sel = '#' + elem.id + sel;
var result = document.querySelectorAll( sel ...
What does $NON-NLS-1$ mean?
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They silence a warning that Eclipse emits when it encounters string literals (and has been configured to complain).
The idea is that UI messages should not be embedded as string literals, but rather sourced from a resource file (so that they can be translated, proofed, etc). Consequen...