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Why is Java's Iterator not an Iterable?
... be possible to implement an Iterable Iterator that implements .iterator() by resetting itself, but this design would still break in some circumstances, for example, if it was passed to a method that takes an Iterable and loops over all possible pairs of elements by nesting for-each loops.
...
Sending a JSON to server and retrieving a JSON in return, without JQuery
...ng the XHR on the submit action of the form, when I changed it to be fired by a click event on. I got the CORS error, that is understandable and I am changing my server side code for that. I wrote about it here medium.com/@viveksinghggits/…
– viveksinghggits
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Should I learn C before learning C++? [closed]
... first and I am not a misled programmer. So your claim is not true, proof by counter example. And yes I do have a gold badge in C as well. The truth of the matter is that they are 2 distinct and different languages. You don't need one language as a dependency to learn the other. That is just a...
mongodb count num of distinct values per field/key
...is example of using aggregation API. To complicate the case we're grouping by case-insensitive words from array property of the document.
db.articles.aggregate([
{
$match: {
keywords: { $not: {$size: 0} }
}
},
{ $unwind: "$keywords" },
{
$group: {...
Disable migrations when running unit tests in Django 1.7
...
Look at this workaround, posted by Bernie Sumption to the Django developers mailing list:
If makemigrations has not yet been run, the "migrate" command treats
an app as unmigrated, and creates tables directly from the models just
like syncdb did in ...
Maven check for updated dependencies in repository
...your projects.
There is also a REST JSON API, for tool integrations.
By the way, I'm the dude who started this project. Let me know if you have questions.
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Getting and removing the first character of a string
I would like to do some 2-dimensional walks using strings of characters by assigning different values to each character. I was planning to 'pop' the first character of a string, use it, and repeat for the rest of the string.
...
Combine two or more columns in a dataframe into a new column with a new name
...OP asks for a space in between the elements, not another separator (which, by the way, would be better put as the sep argument...). The other answer, posted almost 4 years prior to yours, is however perfectly answering the question.
– Cath
Mar 27 '19 at 9:12
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How do I start Mongo DB from Windows?
... 4
cd to C:\Program Files\MongoDB\Server\3.2\bin>
enter command mongod
by default, mongodb server will start at port 27017
Step 5
(optionally) download RoboMongo and follow normal setup instructions
Step 6
Start RoboMongo and create a new connection on localhost:27017
Your MongoDB i...
Why would a post-build step (xcopy) occasionally exit with code 2 in a TeamCity build?
...ory, echo in D:
echo D|xcopy /y ...
Sometimes the above can be resolved by simply using a copy command instead of xcopy:
copy /y ...
However, if there are non-existent directories leading up to the final file destination, then an "exited with code 1" will occur.
Remember: use the /C switch an...