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What does the (unary) * operator do in this Ruby code?
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The * is the splat operator.
It expands an Array into a list of arguments, in this case a list of arguments to the Hash.[] method. (To be more precise, it expands any object that responds to to_ary/to_a, or to_a in Ruby 1.9.)
To illustrate, the following two ...
How do I show the schema of a table in a MySQL database?
From the MySQL console, what command displays the schema of any given table?
5 Answers
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python: Change the scripts working directory to the script's own directory
... @EliCourtwright If __file__ is not already an absolute path, and the user has changed the working directory, then os.path.abspath will fail anyway.
– Arthur Tacca
Jan 17 '17 at 16:16
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Send a file via HTTP POST with C#
I've been searching and reading around to that and couldn't fine anything really useful.
8 Answers
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How to prepend a string to a column value in MySQL?
...hat:
UPDATE tbl SET col=CONCAT('test',col);
If you want to get cleverer and only update columns which don't already have test prepended, try
UPDATE tbl SET col=CONCAT('test',col)
WHERE col NOT LIKE 'test%';
share
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Change a Git remote HEAD to point to something besides master
...t push -f origin master
Making master have what you want people to use, and do all other work in branches.
(a "git-symbolic-ref HEAD refs/head/published" would not be propagated to the remote repo)
This is similar to "How do I delete origin/master in Git".
As said in this thread: (emphasis mine...
How can I initialise a static Map?
...ght? I don't see why you need an extra anonymous class just to initialize. And it won't work if the class being created is final.
You can create an immutable map using a static initialiser too:
public class Test {
private static final Map<Integer, String> myMap;
static {
Map&...
How to disable postback on an asp Button (System.Web.UI.WebControls.Button)
...ly show it for logged in users, but i want it to run a javascript function and it seems when it's runat="server" it always calls the postback event.
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How to select the first element in the dropdown using jquery?
... edited Nov 1 '18 at 20:08
Zander
861414 bronze badges
answered Sep 8 '09 at 15:11
RSolbergRSolberg
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Difference between \n and \r?
What’s the difference between \n (newline) and \r (carriage return)?
10 Answers
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