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How does the following LINQ statement work?
...If you want the output to be 2,4,6, use .ToList():
var list = new List<int>{1,2,4,5,6};
var even = list.Where(m => m%2 == 0).ToList();
list.Add(8);
foreach (var i in even)
{
Console.WriteLine(i);
}
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...
Django ManyToMany filter()
...[<id1>, <id2>, <id3>])
# and by zone object (object gets converted to pk under the covers)
users_in_zones = User.objects.filter(zones__in=[zone1, zone2, zone3])
The double underscore (__) syntax is used all over the place when working with querysets.
...
How do you make a WPF slider snap only to discrete integer positions?
...ider that goes from X to Y but only allows the user to move it in discrete integer positions.
4 Answers
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Do I need to manually close an ifstream?
... the behavior of the code, especially when something throws. If a future maintainer removes them, he doesn't know C++ very well.
– Elliot Cameron
Nov 14 '13 at 22:39
...
What is the most efficient way to store tags in a database?
...elong to many items. This implies to me that you'll quite possibly need an intermediary table to overcome the many-to-many obstacle.
Something like:
Table: Items
Columns: Item_ID, Item_Title, Content
Table: Tags
Columns: Tag_ID, Tag_Title
Table: Items_Tags
Columns: Item_ID, Tag_ID
It might be ...
Is optimisation level -O3 dangerous in g++?
...owdown due to all the code of e.g. some inner loop now not fitting anymore into L1I. Generally gcc tries quite hard to not to generate so much code, but since it usually optimizes the generic case, this can happen. Options especially prone to this (like loop unrolling) are normally not included in -...
How to set up Spark on Windows?
...ava and hit enter.
If you receive a message 'Java' is not recognized as an internal or external command. You need to configure your environment variables, JAVA_HOME and PATH to point to the path of jdk.
Download and install Scala.
Set SCALA_HOME in Control Panel\System and Security\System goto "Ad...
Difference between open and codecs.open in Python
... not in range(128)
The advice about strings for input/ouput is normally "convert to unicode as early as possible and back to bytestrings as late as possible". Using codecs.open allows you to do the latter very easily.
Just be careful that you are giving it unicode strings and not bytestrings that...
How to make unicode string with python3
...
This how I solved my problem to convert chars like \uFE0F, \u000A, etc. And also emojis that encoded with 16 bytes.
example = 'raw vegan chocolate cocoa pie w chocolate &amp; vanilla cream\\uD83D\\uDE0D\\uD83D\\uDE0D\\u2764\\uFE0F Present Moment Ca...
How do I install imagemagick with homebrew?
...ick
Don't forget to install also gs which is a dependency if you want to convert pdf to images for example :
brew install ghostscript
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