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LINQ to SQL: Multiple joins ON multiple Columns. Is this possible?
...eld } equals new { y.field } there is a compiler error. Functionally you didn't change anything. Using .Net 4.6.1.
– user2415376
Oct 28 '16 at 13:59
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Python string class like StringBuilder in C#?
...e-tran are not to be trusted. Andrew Hare makes the mistake of including a call to repr in his methods. That slows all the methods equally but obscures the real penalty in constructing the string.
Use join. It's very fast and more robust.
$ ipython3
Python 3.5.1 (default, Mar 2 2016, 03:38:02)
I...
Get environment variable value in Dockerfile
...y app's configuration is contained within environment variables (loaded inside the app with dotenv ).
6 Answers
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How do I copy a version of a single file from one git branch to another?
...aths do
Multiple paths can be specified
an alternative:
git show commit_id:path/to/file > path/to/file
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Auto start node.js server on boot
...s super easy module that installs a node script as a windows service, it's called node-windows (npm, github, documentation). I've used before and worked like a charm.
var Service = require('node-windows').Service;
// Create a new service object
var svc = new Service({
name:'Hello World',
descr...
How to create index on JSON field in Postgres?
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Found:
CREATE TABLE publishers(id INT, info JSON);
CREATE INDEX ON publishers((info->>'name'));
As stated in the comments, the subtle difference here is ->> instead of ->. The former one returns the value as text, the latter as a JSON obj...
How do I count a JavaScript object's attributes? [duplicate]
...ery object in JavaScript derives from — includes many attributes automatically, and the exact set of attributes you get depends on the particular interpreter and what code has executed before yours. So, you somehow have to separate the ones you defined from those you got "for free."
Here's one wa...
defaultdict of defaultdict?
...gument of a defaultdict (in this case is lambda: defaultdict(int)) will be called when you try to access a key that doesn't exist. The return value of it will be set as the new value of this key, which means in our case the value of d[Key_doesnt_exist] will be defaultdict(int).
If you try to access...
Font from origin has been blocked from loading by Cross-Origin Resource Sharing policy
...er add Access-Control-Allow-Origin "*"
even better, as suggested by @david thomas, you can use a specific domain value, e.g.
Header add Access-Control-Allow-Origin "your-domain.com"
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Why use #ifndef CLASS_H and #define CLASS_H in .h file but not in .cpp?
...te development into two file types. One is with an extension of .h and we call this a "header file." They usually provide a declaration of functions, classes, structs, global variables, typedefs, preprocessing macros and definitions, etc. Basically, they just provide you with information about yo...