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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 specify that a class property is an integer?
...ntiate our properties even at runtime
// they are still just numbers
class Foo {
someId: ID;
someInt: Int;
}
let foo = new Foo();
// compiler won't let you do this due to or markers
foo.someId = 2;
foo.someInt = 1;
// when assigning, you have to cast to the specific type
// NOTE: This is ...
var functionName = function() {} vs function functionName() {}
...ry, if, switch, while, etc., like this:
if (someCondition) {
function foo() { // <===== HERE THERE
} // <===== BE DRAGONS
}
And since they're processed before step-by-step code is run, it's tricky to know what to do when they're in a control structure.
Although...
How to rename with prefix/suffix?
... This is the best answer so far.
– lifeisfoo
Jan 5 '16 at 14:51
I don't think you need the first $ in this...
What does the exclamation mark do before the function?
...
JavaScript syntax 101. Here is a function declaration:
function foo() {}
Note that there's no semicolon: this is just a function declaration. You would need an invocation, foo(), to actually run the function.
Now, when we add the seemingly innocuous exclamation mark: !function foo() {}...
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 method parameter names?
... and **kwargs variables, and the defaults provided. ie.
>>> def foo(a, b, c=4, *arglist, **keywords): pass
>>> inspect.getfullargspec(foo)
(['a', 'b', 'c'], 'arglist', 'keywords', (4,))
Note that some callables may not be introspectable in certain implementations of Python. For...
Prepend a level to a pandas MultiIndex
...ne line using pandas.concat():
import pandas as pd
pd.concat([df], keys=['Foo'], names=['Firstlevel'])
An even shorter way:
pd.concat({'Foo': df}, names=['Firstlevel'])
This can be generalized to many data frames, see the docs.
...
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/...
PHP: How to handle
...</content>'
);
echo (string) $content;
// or with parent element:
$foo = simplexml_load_string(
'<foo><content><![CDATA[Hello, world!]]></content></foo>'
);
echo (string) $foo->content;
You might have better luck with LIBXML_NOCDATA:
$content = simpl...