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Switch on Enum in Java [duplicate]
...'m guessing you intended to say you can’t, but you can. chars have a set range of values, so it's easy to compare. Strings can be anything.
A switch statement is usually implemented as a jump table (branch table) in the underlying compilation, which is only possible with a finite set of values. C...
How to design a product table for many kinds of product where each product has many parameters
...ited the last paragraph to make it more clear, but it's about passing your raw EAV data to a process in a language which can deal with data transformations, lookups in a tree structure or any basic map reduce operations really quickly and in a memory efficient way. The specifics here would depend o...
How do I do a not equal in Django queryset filtering?
...tains
icontains
in
gt
gte
lt
lte
startswith
istartswith
endswith
iendswith
range
year
month
day
week_day
isnull
search
regex
iregex
I'm sure by combining these with the Q objects as Dave Vogt suggests and using filter() or exclude() as Jason Baker suggests you'll get exactly what you need for just...
How to subtract 2 hours from user's local time?
...ours() - 2);
And don't worry about if hours you set will be out of 0..23 range.
Date() object will update the date accordingly.
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How to avoid annoying error “declared and not used”
... for this, for example:
func Use(vals ...interface{}) {
for _, val := range vals {
_ = val
}
}
Which you can use like so:
package main
func main() {
a := "declared and not used"
b := "another declared and not used"
c := 123
Use(a, b, c)
}
There's also a packag...
How to print without newline or space?
... parameterless "print" that adds the final newline:
>>> for i in range(10):
... print i,
... else:
... print
...
0 1 2 3 4 5 6 7 8 9
>>>
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How to increment a datetime by one day?
...
date = datetime.datetime(2003,8,1,12,4,5)
for i in range(5):
date += datetime.timedelta(days=1)
print(date)
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f...
How can I strip all punctuation from a string in JavaScript using regex?
...h as curly quotes, em-dashes, etc), you can easily match on specific block ranges. The General Punctuation block is \u2000-\u206F, and the Supplemental Punctuation block is \u2E00-\u2E7F.
Put together, and properly escaped, you get the following RegExp:
/[\u2000-\u206F\u2E00-\u2E7F\\'!"#$%&()*...
Convert a byte array to integer in Java and vice versa
... bytes = (…)
if (bytes[0] == 0xFF) {
// dead code, bytes[0] is in the range [-128,127] and thus never equal to 255
}
Note that all numeric types are signed in Java with exception to char being a 16-bit unsigned integer type.
...
Maximum filename length in NTFS (Windows XP and Windows Vista)?
...ld in the NTFS $Filename attribute is a byte with no offset; this yields a range of 0-255.
The file name iself can be in different "namespaces". So far there are: POSIX, WIN32, DOS and (WIN32DOS - when a filename can be natively a DOS name). (Since the string has a length, it could contain \0 but t...