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How to use filter, map, and reduce in Python 3
...f noiters(*funcs):
if not funcs:
funcs = [map, filter, zip] # etc
from functools import reduce
globals()[reduce.__name__] = reduce
for func in funcs:
globals()[func.__name__] = lambda *ar, func = func, **kwar: list(func(*ar, **kwar))
try:
yield
finall...
Android: upgrading DB version and adding new table
... //alter existing tables(add column, add/remove constraint)
//etc.
}
}
Using Migration classes
onCreate: Since onCreate will be called when application freshly installed, we also need to execute all migrations(database version updates). So onCreate will looks like this:
pu...
Tracking the script execution time in PHP
PHP must track the amount of CPU time a particular script has used in order to enforce the max_execution_time limit.
18 A...
How can I recover a lost commit in Git?
...`
# is not pointing to the latest so you will need to checkout branch
# in order to be able to update the code.
git checkout <commit-id>
# Create a new branch forked to the given commit
git checkout -b <branch name>
git reflog
You can always use the reflog as well.
git reflog will d...
Convert string to integer type in Go?
...with the format string you can specify the number format (like width, base etc.) along with additional extra characters in the input string.
This is great for parsing custom strings holding a number. For example if your input is provided in a form of "id:00123" where you have a prefix "id:" and the...
How to display count of notifications in app launcher icon [duplicate]
...anks, It's work well, But I wonder how apps like Line, What's app, Solmail etc. uses badge without those lots of permissions. Any Idea?
– Saeed.re
Nov 6 '14 at 15:15
...
How to override to_json in Rails?
...t::json.encode. This happens for all types: object, numeric, date, string, etc (see the ActiveSupport code).
ActiveRecord objects behave the same way. There is a default as_json implementation that creates a hash that includes all the model's attributes. You should override as_json in your Model to...
Xcode find caller functions
... the file panel options (the one that has the "open recent, open unsaved...etc" drop down
EDIT #2
here's a picture to clarify (since i dont know what this menu button is called):
ALSO - XCode 4.5 is no longer beta, i believe, and is actually out in public
EDIT #3
also note that this caller thin...
How does type Dynamic work and how to use it?
... If you use do checks at runtime, you have to do the parameter checking in order to dispatch correctly to the right code path. That shouldn't be more overhead than any other parameter checking in your application has. If you make use of reflection, you get obviously more overhead but you have to mea...
Difference between shared objects (.so), static libraries (.a), and DLL's (.so)?
...ile is incorrect. The header file defines prototypes which are required in order to compile the code which uses the library, but at link time the linker looks inside the library itself to make sure the functions it needs are actually there. The linker has to find the function bodies somewhere at lin...