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In Java, are enum types inside a class static?
...r class they'd break the enum guarantee -
e.g. if you had
public class Foo {
private enum Bar {
A, B, C;
}
}
For the enum values to properly act as constants, (psuedocode, ignoring access restrictions)
Bar b1 = new Foo().A
Bar b2 = new Foo().A
b1 and b2 would have to be the s...
Detect when an image fails to load in Javascript
...eNotFound() {
alert('That image was not found.');
}
testImage("http://foo.com/bar.jpg");
And my sympathies for the jQuery-resistant boss!
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python re.sub group: number after \number
How can I replace foobar with foo123bar ?
1 Answer
1
...
How to access outer class from an inner class?
...native to `with_metaclass`
class Outer(with_metaclass(OuterMeta)):
def foo(self):
return "I'm outer class!"
class Inner(object):
outer = None # <-- by default it's None
def bar(self):
return "I'm inner class"
print(Outer.Inner.outer)
>>> &...
Count, size, length…too many choices in Ruby?
... Something to consider with this is counter_cache. If have a table, foo, and it has_many bar, you'll have a column in foo named bars_count that gets updated anytime a bar is created / destroyed. Using foo.bars.size is what checks that column (without actually querying any bars). foo.bars.coun...
Using backticks around field names
...th it,
you'll note if you run your query as such
EXPLAIN EXTENDED Select foo,bar,baz
The generated warning that comes back will have back-ticks and fully qualified table names. So if you're using query generation features and automated re-writing of queries, backticks would make anything parsin...
How to read a text-file resource into Java unit test? [duplicate]
...:
package com.example;
import org.apache.commons.io.IOUtils;
public class FooTest {
@Test
public void shouldWork() throws Exception {
String xml = IOUtils.toString(
this.getClass().getResourceAsStream("abc.xml"),
"UTF-8"
);
}
}
Works perfectly. File src/test/resources/c...
How to use GROUP BY to concatenate strings in SQL Server?
...ou can write code like this to get the result you asked for:
CREATE TABLE foo
(
id INT,
name CHAR(1),
Value CHAR(1)
);
INSERT INTO dbo.foo
(id, name, Value)
VALUES (1, 'A', '4'),
(1, 'B', '8'),
(2, 'C', '9');
SELECT id,
dbo.GROUP_CONCAT(name + ':' + Value) AS [Column...
Why does Stream not implement Iterable?
...eam::iterator
To pass a Stream to a method that expects Iterable,
void foo(Iterable<X> iterable)
simply
foo(stream::iterator)
however it probably looks funny; it might be better to be a little bit more explicit
foo( (Iterable<X>)stream::iterator );
...
What is the difference between include and extend in Ruby?
...s they don't clash
It gives Klazz access to Mod's module variables, e.g. @@foo or @@bar
raises ArgumentError if there are cyclic includes
Attaches the module as the caller's immediate ancestor (i.e. It adds Mod to Klazz.ancestors, but Mod is not added to the chain of Klazz.superclass.superclass.supe...