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Regex to check whether a string contains only numbers [duplicate]
I get false on both "123" and "123f" . I would like to check if the hash only contains numbers. Did I miss something?
21...
Proper usage of Optional.ifPresent()
I am trying to understand the ifPresent() method of the Optional API in Java 8.
5 Answers
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Is it good practice to use the xor operator for boolean checks? [closed]
...What @RobertGrant said). Most humans would understand the first one easier if they know what xor is (which is pretty useful to know if you're in the field of computing...)
– Harold R. Eason
Nov 22 '13 at 20:53
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How can I get a list of all classes within current module in Python?
...):
for name, obj in inspect.getmembers(sys.modules[__name__]):
if inspect.isclass(obj):
print(obj)
And even better:
clsmembers = inspect.getmembers(sys.modules[__name__], inspect.isclass)
Because inspect.getmembers() takes a predicate.
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What's wrong with this 1988 C code?
...When the preprocessor expands them, your code will look roughly like:
if (c == ' ' || c == '\n' || c == '\t')
state = 0;; /* <--PROBLEM #1 */
else if (state == 0;) { /* <--PROBLEM #2 */
state = 1;;
That second semicolon causes the else to have no previous if as a mat...
Why use HttpClient for Synchronous Connection
...tivity, but what I am doing is purely synchronous, so I cannot see any significant benefit over using HttpWebRequest .
5 A...
Can I use __init__.py to define global variables?
...e:
>>> from mypackage import mymodule
my constant is 42
Still, if you do have constants, it would be reasonable (best practices, probably) to put them in a separate module (constants.py, config.py, ...) and then if you want them in the package namespace, import them.
mypackage/__init__....
Concatenating two std::vectors
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I have a question. Will this work if vector1 and vector2 are the same vectors?
– Alexander Rafferty
Jul 17 '11 at 9:36
6
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in_array multiple values
... to the targets:
$haystack = array(...);
$target = array('foo', 'bar');
if(count(array_intersect($haystack, $target)) == count($target)){
// all of $target is in $haystack
}
Note that you only need to verify the size of the resulting intersection is the same size as the array of target valu...
How to easily resize/optimize an image size with iOS?
...the iPhone is PNG, because it has optimizations for that format. However, if you want to store these images as JPEGs, you can take your UIImage and do the following:
NSData *dataForJPEGFile = UIImageJPEGRepresentation(theImage, 0.6);
This creates an NSData instance containing the raw bytes for a...