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Do DOM tree elements with ids become global variables?
... with the same name (it returns a reference to a single node instead of an array of references).
And I'm sure there's more if you try using named access on edge cases.
As mentioned in other answers use document.getElementById to get a reference to a DOM node by its id. If you need to get a refer...
Python: Tuples/dictionaries as keys, select, sort
...thon is the tuple-dict combination. What you have here is effectively a 2d array (where x = fruit name and y = color), and I am generally a supporter of the dict of tuples for implementing 2d arrays, at least when something like numpy or a database isn't more appropriate. So in short, I think you've...
How to optimize for-comprehensions and loops in Scala?
...scope. Or better, intern them like Strings literals in Java.
footnote:
Arrays were about the same as Range, but interestingly, pimping a new forall method (shown below) resulted in 24% faster execution on 64-bit, and 8% faster on 32-bit. When I reduced the calculation size by reducing the number...
Why does C++11 not support designated initializer lists as C99? [closed]
...der of the data members
int arr[3] = { [1] = 5 } is invalid in C++ because array designated initialization is not supported
struct B b = {.a.x = 0} is invalid in C++ because designators cannot be nested
struct A c = {.x = 1, 2} is invalid in C++ because either all or none of the data members must be...
Read a text file using Node.js?
...
You'll want to use the process.argv array to access the command-line arguments to get the filename and the FileSystem module (fs) to read the file. For example:
// Make sure we got a filename on the command line.
if (process.argv.length < 3) {
console.lo...
CASCADE DELETE just once
...t-- if it does, it recursively calls itsself on the found data. It uses an array of data already marked for deletion to prevent infinite loops. Please test it out and let me know how it works for you. Note: It's a little slow.
I call it like so:
select delete_cascade('public','my_table','1');
creat...
Accessing dict keys like an attribute?
...
You can have all legal string characters as part of the key if you use array notation.
For example, obj['!#$%^&*()_']
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Typescript: difference between String and string
...ng. In JavaScript, it is also considered better to use object literals and array literals too:
var arr = []; // not var arr = new Array();
var obj = {}; // not var obj = new Object();
If you really had a penchant for the string, you could use it in TypeScript in one of two ways...
var str: Strin...
How do I check if a type is a subtype OR the type of an object?
...her, but rather whether one type is assignment compatible with another. An array of uint isn't a subclass of an array of int, but they are assignment compatible. IEnumerable<Giraffe> isn't a subclass of IEnumerable<Animal>, but they are assignment compatible in v4.
–...
Is there any difference between the `:key => “value”` and `key: “value”` hash notations?
...
Yes, there is a difference. These are legal:
h = { :$in => array }
h = { :'a.b' => 'c' }
h[:s] = 42
but these are not:
h = { $in: array }
h = { 'a.b': 'c' } # but this is okay in Ruby2.2+
h[s:] = 42
You can also use anything as a key with => so you can do this:
h = { C.ne...