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What is the difference between __dirname and ./ in node.js?
...ide require is always relative to the file containing the call to require.
For example...
Let's say your directory structure is
/dir1
/dir2
pathtest.js
and pathtest.js contains
var path = require("path");
console.log(". = %s", path.resolve("."));
console.log("__dirname = %s", path.resolve(__d...
Why does ReSharper tell me “implicitly captured closure”?
...ted as long as the first lambda is in use.
The compiler generates a class for both lambda expressions and puts all variables in that class which are used in the lambda expressions.
So in my example g and i are held in the same class for execution of my delegates. If g is a heavy object with a lot ...
Elegant Python function to convert CamelCase to snake_case?
...name
If you do this many times and the above is slow, compile the regex beforehand:
pattern = re.compile(r'(?<!^)(?=[A-Z])')
name = pattern.sub('_', name).lower()
To handle more advanced cases specially (this is not reversible anymore):
def camel_to_snake(name):
name = re.sub('(.)([A-Z][a-z]+...
What is the most pythonic way to check if an object is a number?
...ber
... from decimal import Decimal
... from fractions import Fraction
... for n in [2, 2.0, Decimal('2.0'), complex(2, 0), Fraction(2, 1), '2']:
... print(f'{n!r:>14} {isinstance(n, Number)}')
2 True
2.0 True
Decimal('2.0') True
(2+0j) True
Fraction(2, 1)...
Delete column from pandas DataFrame
...en a column is to be removed, the DataFrame needs to have its own handling for "how to do it". In the case of del df[name], it gets translated to df.__delitem__(name) which is a method that DataFrame can implement and modify to its needs. In the case of del df.name, the member variable gets removed ...
Are there legitimate uses for JavaScript's “with” statement?
...laring a closure in a loop is a common task where this can lead to errors:
for (var i=0; i<3; ++i)
{
var num = i;
setTimeout(function() { alert(num); }, 10);
}
Because the for loop does not introduce a new scope, the same num - with a value of 2 - will be shared by all three functions.
A n...
When to use Comparable and Comparator
...e sorting was an unusual use of the class, or the sorting only makes sense for a specific use case, then a Comparator is a better option.
Put another way, given the class name, is it clear how a comparable would sort, or do you have to resort to reading the javadoc? If it is the latter, odds are ev...
How to find the JVM version from a program?
... Java Runtime Environment version date, in ISO-8601 YYYY-MM-DD format, which may be interpreted as a LocalDate
java.vendor "Oracle Corporation" "Oracle Corporation" "Sun Microsystems Inc." Java Runt...
Is it possible to declare two variables of different types in a for loop?
...o declare two variables of different types in the initialization body of a for loop in C++?
8 Answers
...
Calling class staticmethod within the class body?
...2E3CBA8>
>>> dir(z)
['__class__', '__delattr__', '__doc__', '__format__', '__func__', '__get__', '__getattribute__', '__hash__', '__init__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__']
>>> z.__func__
<funct...