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What does send() do in Ruby?
..., those lines are equivalent:
1.send '+', 2
1.+(2)
1 + 2
Note that send bypasses visibility checks, so that you can call private methods, too (useful for unit testing).
If there is really no variable before send, that means that the global Object is used:
send :to_s # "main"
send :class ...
App Inventor 2 低功耗蓝牙(BLE) 硬件接入、数据通信及IO控制 · App Inventor 2 中文网
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低功耗蓝牙(BLE)以低功耗、低成本、开发简便逐渐被广泛应用，本文主要介绍一款较...
Can I add comments to a pip requirements file?
...hat begins with # is treated as a comment and ignored. Whitespace followed by a # causes the # and the remainder of the line to be treated as a comment.
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Google Developer Tools “Network” Tab clears after redirect
...pparently, the issue is manifesting itself when you are filtering requests by "Doc". This filter is quite useful for filtering out all the noise from resource requests. In any case, when filtering by "Doc" (or some other filter), the original (pre-direction) POST requests are still recorded, but ke...
Does a view exist in ASP.NET MVC?
...se this across multiple controller actions, building on the solution given by Dave, you can define a custom view result as follows:
public class CustomViewResult : ViewResult
{
protected override ViewEngineResult FindView(ControllerContext context)
{
string name = SomeMethodToGetVie...
How to apply a patch generated with git format-patch?
...ur git log, you’ll find that the commit messages contain a “Signed-off-by” tag. This tag will be read by Github and others to provide useful info about how the commit ended up in the code.
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Disable all table constraints in Oracle
...'
AND NOT (t.iot_type IS NOT NULL AND c.constraint_type = 'P')
ORDER BY c.constraint_type DESC)
LOOP
dbms_utility.exec_ddl_statement('alter table "' || c.owner || '"."' || c.table_name || '" disable constraint ' || c.constraint_name);
END LOOP;
END;
/
Enabling the constraints again i...
PG::ConnectionBad - could not connect to server: Connection refused
...s postgres didn't delete the PID (process id) file.
The PID file is used by postgres to make sure only one instance of the server is running at a time. So when it goes to start again, it fails because there is already a PID file which tells postgres that another instance of the server was started ...
How do I show the schema of a table in a MySQL database?
...answered Sep 30 '09 at 15:17
BobbyBobby
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How to install multiple python packages at once using pip
...
You can simply place multiple name together separated by a white space like
C:\Users\Dell>pip install markdown django-filter
#c:\Users\Dell is path in my pc this can be anything on yours
this installed markdown and django-filter on my device.
...