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What does iota of std::iota stand for?
...irst n integers when applied to the argument n, …
That ι is the lower-case Greek letter iota.
In the quote above, I typed ι, U+03B9, “GREEK SMALL LETTER IOTA”, but Unicode actually has a dedicated code point for APL's iota: ⍳ is U+2373, “APL FUNCTIONAL SYMBOL IOTA”.
In response t...
`levels
...anguage. If I remember correctly this construct in functional languages is called a lens.
But then, once you have defined replacement functions like levels<-, you get another, unexpected windfall: you don't just have the ability to make assignments, you have a handy function that takes in a fact...
How to capture stdout output from a Python function call?
...
Try this context manager:
from io import StringIO
import sys
class Capturing(list):
def __enter__(self):
self._stdout = sys.stdout
sys.stdout = self._stringio = StringIO()
return self
def __exit__(self, *args):
self.extend(self._stringio.getvalue().spl...
Build vs new in Rails 3
...new is creating a new Client object from the clients collection, and so it can automatically set the firm_id to some_firm.id, whereas the docs are calling Client.new which has no knowledge of any Firm's id at all, so it needs the firm_id passed to it.
The only difference between some_firm.clients.n...
Rails has_and_belongs_to_many migration
... table with only a restaurant_id and user_id (no primary key), in alphabetical order.
First run your migrations, then edit the generated migration file.
Rails 3
rails g migration create_restaurants_users_table
Rails 4:
rails g migration create_restaurants_users
Rails 5
rails g migration Cr...
API Keys vs HTTP Authentication vs OAuth in a RESTful API
I'm working on building a RESTful API for one of the applications I maintain. We're currently looking to build various things into it that require more controlled access and security. While researching how to go about securing the API, I found a few different opinions on what form to use. I've seen ...
Why is GHC so large/big?
...getting 4 copies of GHC. Not only that, but the GHC binary itself is statically linked, so that's 5 copies of GHC.
We recently made it so that GHCi could use the static .a files. That will allow us to get rid of one of these flavours. Longer term, we should dynamically link GHC, but that's a big...
JavaScript function order: why does it matter?
JSHint complains when my JavaScript calls a function that is defined further down the page than the call to it. However, my page is for a game, and no functions are called until the whole thing has downloaded. So why does the order functions appear in my code matter?
...
git --git-dir not working as expected
...bility thing.
git --git-dir=/mycode/.git --work-tree=/mycode status
You can read a little more here
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What does principal end of an association means in 1:1 relationship in Entity framework
...dependent. Principal end is the one which will be inserted first and which can exist without the dependent one. Dependent end is the one which must be inserted after the principal because it has foreign key to the principal.
In case of entity framework FK in dependent must also be its PK so in your...