Depending upon use case, I would normally use something simple like the following: abstract class DaysOfWeek { const Sunday = 0; const Monday = 1; // etc. } $today = DaysOfWeek::Sunday; However, other use cases may require more validation of constants and values. Based on the comments below about reflection, and a few other notes, …
git reset –hard # removes staged and working directory changes ## !! be very careful with these !! ## you may end up deleting what you don’t want to ## read comments and manual. git clean -f -d # remove untracked git clean -f -x -d # CAUTION: as above but removes ignored files like …
Use both IPv4 and IPv6 You should use both IPv4 and IPv6 addresses. Nearly everyone on the Internet currently has an IPv4 address, or is behind a NAT of some kind, and can access IPv4 resources. However, at the time of writing only about 0.7% 2.3% 3.8% 6.5% 9% 12% 19% 22% 26% 32% 37% …
This should be as simple as: with open(‘somefile.txt’, ‘a’) as the_file: the_file.write(‘Hello\n’) From The Documentation: Do not use os.linesep as a line terminator when writing files opened in text mode (the default); use a single ‘\n’ instead, on all platforms. Some useful reading: The with statement open() ‘a’ is for append, or use ‘w’ to …
You cannot declare a variable or value as constant in Python. To indicate to programmers that a variable is a constant, one usually writes it in upper case: CONST_NAME = “Name” To raise exceptions when constants are changed, see Constants in Python by Alex Martelli. Note that this is not commonly used in practice. As …
Summary The error message Cannot ‘squash’ without a previous commit means you likely attempted to “squash downward.” Git always squashes a newer commit into an older commit or “upward” as viewed on the interactive rebase todo list, that is into a commit on a previous line. Changing the command on your todo list’s very first …
Is there a JavaScript equivalent of Java’s class.getName()? No. ES2015 Update: the name of class Foo {} is Foo.name. The name of thing‘s class, regardless of thing‘s type, is thing.constructor.name. Builtin constructors in an ES2015 environment have the correct name property; for instance (2).constructor.name is “Number”. But here are various hacks that all fall down …
If you really want to use single quotes in the outermost layer, remember that you can glue both kinds of quotation. Example: alias rxvt=”urxvt -fg “”‘”‘#111111′”‘”‘ -bg ‘”‘”‘#111111′”‘” # ^^^^^ ^^^^^ ^^^^^ ^^^^ # 12345 12345 12345 1234 Explanation of how ‘”‘”‘ is interpreted as just ‘: ‘ End first quotation which uses single quotes. …
Solution The compiler is warning about this for a reason. It’s very rare that this warning should simply be ignored, and it’s easy to work around. Here’s how: if (!_controller) { return; } SEL selector = NSSelectorFromString(@”someMethod”); IMP imp = [_controller methodForSelector:selector]; void (*func)(id, SEL) = (void *)imp; func(_controller, selector); Or more tersely (though hard …
Python never implicitly copies objects. When you set dict2 = dict1, you are making them refer to the same exact dict object, so when you mutate it, all references to it keep referring to the object in its current state. If you want to copy the dict (which is rare), you have to do so …