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Strange, unexpected behavior (disappearing/changing values) when using Hash default value, e.g. Hash
...applies to any default value that is subsequently mutated (e.g. hashes and strings), not just arrays.
TL;DR: Use Hash.new { |h, k| h[k] = [] } if you want the most idiomatic solution and don’t care why.
What doesn’t work
Why Hash.new([]) doesn’t work
Let’s look more in-depth at why Has...
Singleton: How should it be used
...er in wikipedia)
In user interface widgets
It is supposed to be a cache
In strings
In Sessions
I can go all day long
How to create the best singleton:
The smaller, the better. I am a minimalist
Make sure it is thread safe
Make sure it is never null
Make sure it is created only once
Lazy or system ...
Allow CORS REST request to a Express/Node.js application on Heroku
...he solution was not related to CORS.
Turns out that JSON Web Token secret string was not defined in the environment variables, so the token could not be signed.
This caused to any POST request that relies on checking or signing a token to get a timeout and return a 503 error, telling the browser th...
Why is a C++ Vector called a Vector?
...rdered sequence of values could apply to std::list, std::deque, std::basic_string, etc.
– jamesdlin
Jun 27 '17 at 10:23
...
How do you check what version of SQL Server for a database using TSQL?
...ET @ver = CAST(serverproperty('ProductVersion') AS nvarchar)
SET @ver = SUBSTRING(@ver, 1, CHARINDEX('.', @ver) - 1)
IF ( @ver = '7' )
SELECT 'SQL Server 7'
ELSE IF ( @ver = '8' )
SELECT 'SQL Server 2000'
ELSE IF ( @ver = '9' )
SELECT 'SQL Server 2005'
ELSE IF ( @ver = '10' )
SELECT 'SQ...
Protecting executable from reverse engineering?
...memory location wouldnt cause any damage so long as you didnt execute that string of instructions again. You could probably still use a trick like this today as pipelined processors fetch the next instruction. Or if you know that the hardware has a separate instruction and data cache you can modif...
Android: show soft keyboard automatically when focus is on an EditText
...rride
public void onClick(DialogInterface dialog, int which) {
String text = textEdit.getText().toString();
finish();
}
});
alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
...
Passing a function with parameters as a parameter?
...
@FerdinandBeyer , lets say myvar is a string and its changed between two consecutive invocations of passing changeViewMode as a closure, but changeViewMode always receives the first value of myvar , I want to call closure function with different argument value ...
Mapping composite keys using EF code first
... in your code:
public class MyTable
{
[Key, Column(Order = 0)]
public string SomeId { get; set; }
[Key, Column(Order = 1)]
public int OtherId { get; set; }
}
You can also look at this SO question. If you want official documentation, I would recommend looking at the official EF website. H...
What is the difference between ~> and >= when specifying rubygem in Gemfile?
...git incrementing to some arbitrary value, but the ones preceding it in the string cannot be greater than what you provided. Thus for ~>0.8.5, any value is acceptable for the third digit (the 5) provided that it is greater than or equal to 5, but the leading 0.8 must be "0.8".
You might do this, ...