Use a “closure”: $(edit_link).click(function(){ return changeViewMode(myvar); }); This creates an anonymous temporary function wrapper that knows about the parameter and passes it to the actual callback implementation.
It signifies the end of the positional only parameters, parameters you cannot use as keyword parameters. Before Python 3.8, such parameters could only be specified in the C API. It means the key argument to __contains__ can only be passed in by position (range(5).__contains__(3)), not as a keyword argument (range(5).__contains__(key=3)), something you can do with … Read more
The scope is as you would expect. The perhaps surprising thing is that the default value is only calculated once and reused, so each time you call the function you get the same list, not a new list initialized to []. The list is stored in f.__defaults__ (or f.func_defaults in Python 2.) def f(a, L=[]): … Read more
You can always pass a dictionary as an argument to a function. For instance, dict = {‘a’:1, ‘b’:2} def myFunc(a=0, b=0, c=0): print(a,b,c) myFunc(**dict)
It’s all because OpenCV uses Automatic Memory Management. OpenCV handles all the memory automatically. First of all, std::vector, Mat, and other data structures used by the functions and methods have destructors that deallocate the underlying memory buffers when needed. This means that the destructors do not always deallocate the buffers as in case of Mat. … Read more
The parent shell, the one invoking bash show_files.sh *, expands the * for you. In your script, you need to use: for dir in “$@” do echo “$dir” done The double quotes ensure that multiple spaces etc in file names are handled correctly. See also How to iterate over arguments in a bash shell script. … Read more
I realize people linked to other questions which mentioned PostSharp, but I couldn’t help posting the code that solved my problem (using PostSharp) so other people could benefit from it. class Program { static void Main(string[] args) { Trace.Listeners.Add(new TextWriterTraceListener(Console.Out)); new MyClass().MyMethod(44, “asdf qwer 1234”, 3.14f, true); Console.ReadKey(); } } public class MyClass { public … Read more
There is no clear limit, but I am uncomfortable with more than 3-4 parameters. AFAIR Uncle Bob Martin in Clean Code recommends max 3. There are several refactorings to reduce the number of method parameters (see Working Effectively with Legacy Code, by Michael Feathers for details). These come to my mind: encapsulate many related parameters … Read more
This approach to using new-object should work: $cert = new-object System.Security.Cryptography.X509Certificates.X509Certificate ` -ArgumentList @(,$bytes) The trick is that PowerShell is expecting an array of constructor arguments. When there is only one argument and it is an array, it can confuse PowerShell’s overload resolution algorithm. The code above helps it out by putting the byte array … Read more
Try: <%= link_to “Add to cart”, {:controller => “car”, :action => “add_to_cart”, :car => car.id }%> and then in your controller @car = Car.find(params[:car]) which, will find in your ‘cars’ table (as with rails pluralization) in your DB a car with id == to car.id