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What causes and what are the differences between NoClassDefFoundError and ClassNotFoundException?
...e that the class SomeClass in in your CLASSPATH.
private static SomeClass foo = new SomeClass();
Tip : To find out which jar a class belongs to, you can use the web site jarFinder . This allows you to specify a class name using wildcards and it searches for the class in its database of jars. jarh...
Which is more efficient, a for-each loop, or an iterator?
...
I believe he was saying the opposite, that foo.get(i) can be a lot less efficient. Think of LinkedList. If you do a foo.get(i) on the middle of a LinkedList it has to traverse all the previous nodes to get to i. An iterator, on the other hand, will keep a handle to...
Argparse: Required arguments listed under “optional arguments”?
...ver you want to call them):
parser = argparse.ArgumentParser(description='Foo')
parser.add_argument('-o', '--output', help='Output file name', default='stdout')
requiredNamed = parser.add_argument_group('required named arguments')
requiredNamed.add_argument('-i', '--input', help='Input file name', ...
What's the difference between “declare class” and “interface” in TypeScript
...e.
For example when we have the following interface:
interface test {
foo: number,
bar: string,
}
The objects which we define which have this interface type need to match the interface exactly:
// perfect match has all the properties with the right types, TS compiler will not complain.
c...
JavaScript DOM remove element
...
If you are happy to use the brilliant function:
$("#foo").remove();
To completely delete the element from the DOM.
To remove the elements without removing data and events, use this instead:
$("#foo").detach();
jQuery Docs
The .remove() method takes elements out of the DOM. ...
Why do we use Base64?
...to encode characters not valid for a URL in the URL itself:
http://www.foo.com/hello my friend -> http://www.foo.com/hello%20my%20friend
This is because we want to send a space over a system that will think the space is smelly.
All we are doing is ensuring there is a 1-to-1 mapping between...
What's the difference between eval, exec, and compile?
... compile('for i in range(3): print("Python is cool")',
'foo.py', 'exec')
>>> eval(code)
Python is cool
Python is cool
Python is cool
If one looks into eval and exec source code in CPython 3, this is very evident; they both call PyEval_EvalCode with same arguments, the o...
Mock vs MagicMock
...
What is the reason for plain Mock existing?
Mock's author, Michael Foord, addressed a very similar question at Pycon 2011 (31:00):
Q: Why was MagicMock made a separate thing rather than just folding the ability into the default mock object?
A: One reasonable answer is that the way M...
Find a value anywhere in a database
...types.
A pseudo-code description could be select * from * where any like 'foo'
--------------------------------------------------------------------------------
-- Search all columns in all tables in a database for a string.
-- Does not search: image, sql_variant or user-defined types.
-- Exact sea...
Can anyone explain IEnumerable and IEnumerator to me? [closed]
...merable makes using foreach possible.
When you write code like:
foreach (Foo bar in baz)
{
...
}
it's functionally equivalent to writing:
IEnumerator bat = baz.GetEnumerator();
while (bat.MoveNext())
{
bar = (Foo)bat.Current
...
}
By "functionally equivalent," I mean that's actually ...