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Ruby: Calling class method from instance
In Ruby, how do you call a class method from one of that class's instances? Say I have
9 Answers
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How to organize large R programs?
...
If you're growing your source-tree/analysis "organically," don't you find this hard to do/cumbersome? If you notice a mistake in your code (common while exploring a new problem space), you have to (i) fix source; (ii) reinstall package; (iii) reload it into your workspace? I...
How come a non-const reference cannot bind to a temporary object?
... C++ doesn't want you to accidentally
modify temporaries, but directly
calling a non-const member function on
a modifiable rvalue is explicit, so
it's allowed ...
Basically, you shouldn't try to modify temporaries for the very reason that they are temporary objects and will die any moment ...
How do you loop through each line in a text file using a windows batch file?
...stead of % : (Type help for)
for /F "tokens=1,2,3" %%i in (myfile.txt) do call :process %%i %%j %%k
goto thenextstep
:process
set VAR1=%1
set VAR2=%2
set VAR3=%3
COMMANDS TO PROCESS INFORMATION
goto :EOF
What this does:
The "do call :process %%i %%j %%k" at the end of the for command passes the i...
What do all of Scala's symbolic operators mean?
...ose of teaching, into four categories:
Keywords/reserved symbols
Automatically imported methods
Common methods
Syntactic sugars/composition
It is fortunate, then, that most categories are represented in the question:
-> // Automatically imported method
||= // Syntactic sugar
++= // Sy...
Is there a way to provide named parameters in a function call in JavaScript?
...structuring can be used to simulate named parameters. It would require the caller to pass an object, but you can avoid all of the checks inside the function if you also use default parameters:
myFunction({ param1 : 70, param2 : 175});
function myFunction({param1, param2}={}){
// ...function body...
Constructor of an abstract class in C#
...bstract class. That way you can have classes that inherit from that class call the base constructor.
public abstract class A{
private string data;
protected A(string myString){
data = myString;
}
}
public class B : A {
B(string myString) : base(myString){}
}
...
How to set a Django model field's default value to a function call / callable (e.g., a date relative
...n to create a field in the class.
PRE Django 1.7
Django lets you pass a callable as the default, and it will invoke it each time, just as you want:
from datetime import datetime, timedelta
class MyModel(models.Model):
# default to 1 day from now
my_date = models.DateTimeField(default=lambda:...
How to find memory leak in a C++ code/project?
... I have to delete "some parameter" in the someFunction, after the function call, or are these automatically deleted?
– 19greg96
May 26 '13 at 17:31
1
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`from … import` vs `import .` [duplicate]
...on2.7/os.pyc'>
>>> globals()['os.path']
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
KeyError: 'os.path'
>>>
From the above example, we found that only os is added to the local and global namespaces.
So, we should be able to use os:
...