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JavaScript Nested function
...n attached to an object that is accessible outside the function:
function foo(doBar)
{
function bar()
{
console.log( 'bar' );
}
function baz()
{
console.log( 'baz' );
}
window.baz = baz;
if ( doBar ) bar();
}
In this example, the baz function will be available for use af...
Delete all local changesets and revert to tree
... of those.
If the target revision is called good and your clone is called foo, then do:
hg clone -r good foo foo-clean
This will be a fast, local operation -- there is no reason to download everything again. The foo-clean clone will only contain changesets up to revision good. You can now replac...
SQL standard to escape column names?
...
According to SQLite,
'foo' is an SQL string
"foo" is an SQL identifier (column/table/etc)
[foo] is an identifier in MS SQL
`foo` is an identifier in MySQL
For qualified names, the syntax is: "t"."foo" or [t].[foo], etc.
MySQL supports the stand...
How do I rename all folders and files to lowercase on Linux?
...meone explain to my why this should work in the first place? If it finds ./FOO and ./FOO/BAR, it first renames ./FOO to ./foo, after which it can no longer find ./FOO/BAR. Entering my own answer below that should fix this.
– oisyn
Feb 14 '19 at 15:54
...
What's the difference between Ruby's dup and clone methods?
...lone copies the singleton class, while dup does not.
o = Object.new
def o.foo
42
end
o.dup.foo # raises NoMethodError
o.clone.foo # returns 42
Second, clone preserves the frozen state, while dup does not.
class Foo
attr_accessor :bar
end
o = Foo.new
o.freeze
o.dup.bar = 10 # succeeds
o...
Why doesn't c++ have &&= or ||= for booleans?
... can happen &&= and ||= were used as syntactic sugar for bool foo = foo && bar and bool foo = foo || bar ?
...
C# Object Pooling Pattern implementation
...ing statement, so the object gets freed at the end.
using (PooledObject<Foo> pooledObject = SharedPools.Default<List<Foo>>().GetPooledObject())
{
// Do something with pooledObject.Object
}
// Example 2 - No using statement so you need to be sure no exceptions are not thrown.
L...
Why is there a `null` value in JavaScript?
...d can't tell you whether the variable/property exists or not.
console.log(foo); // "ReferenceError: foo is not defined"
// foo does not exist
var foo;
console.log(foo); // "undefined", a different response
console.log(foo === undefined); /...
Include constant in string without concatenating
...
Yes it is (in some way ;) ):
define('FOO', 'bar');
$test_string = sprintf('This is a %s test string', FOO);
This is probably not what you were aiming for, but I think, technically this is not concatenation but a substitution and from this assumption, it inclu...
Is it possible to make abstract classes in Python?
...mport ABC, abstractmethod
class Abstract(ABC):
@abstractmethod
def foo(self):
pass
# Python 3.0+
from abc import ABCMeta, abstractmethod
class Abstract(metaclass=ABCMeta):
@abstractmethod
def foo(self):
pass
# Python 2
from abc import ABCMeta, abstractmethod
c...