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What is the difference between server side cookie and client side cookie?
...rence between creating cookies on the server and on the client? Are these called server side cookies and client side cookies? Is there a way to create cookies that can only be read on the server or on the client?
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Initialization of an ArrayList in one line
...or later, after List.of() was added:
List<String> strings = List.of("foo", "bar", "baz");
With Java 10 or later, this can be shortened with the var keyword.
var strings = List.of("foo", "bar", "baz");
This will give you an immutable List, so it cannot be changed.
Which is what you want in mo...
How do you assert that a certain exception is thrown in JUnit 4 tests?
...t can use JUnit 4.7, you can use the ExpectedException Rule:
public class FooTest {
@Rule
public final ExpectedException exception = ExpectedException.none();
@Test
public void doStuffThrowsIndexOutOfBoundsException() {
Foo foo = new Foo();
exception.expect(IndexOutOfBoundsExcepti...
How to get a list of column names on Sqlite3 database?
...
PRAGMA table_info(table_name);
will get you a list of all the column names.
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Is there a literal notation for an array of symbols?
...
Yes! This is possible now in Ruby 2.0.0. One way to write it is:
%i{foo bar} # => [:foo, :bar]
You can also use other delimiters, so you could also write %i(foo bar) or %i!foo bar! for example.
This feature was originally announced here:
http://www.ruby-lang.org/zh_TW/news/2012/11/02/...
Given a class, see if instance has method (Ruby)
...d
then read this:
In Ruby, a property (attribute) on your model is basically a method also. So method_defined? will also return true for properties, not just methods.
For example:
Given an instance of a class that has a String attribute first_name:
<instance>.first_name.class #=> Stri...
Determine .NET Framework version for dll
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This answer is the most helpful. All Windows OSes after 2003 support Powershell. A shell giving immediate feedback, not requiring any additional application support as many of the other answers suggest. Great for a "one off" check of a dll. you're the man @...
How to convert a PIL Image into a numpy array?
...to a numpy array this way:
import numpy
import PIL
img = PIL.Image.open("foo.jpg").convert("L")
imgarr = numpy.array(img)
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What is the proper way to check if a string is empty in Perl?
... situation where you haven't already guarded against undef, then the catch-all for "non-empty" that won't warn is if (defined $str and length $str).
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How do I compare strings in Java?
I've been using the == operator in my program to compare all my strings so far.
However, I ran into a bug, changed one of them into .equals() instead, and it fixed the bug.
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