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How do you detect where two line segments intersect? [closed]
How do I determine whether or not two lines intersect, and if they do, at what x,y point?
27 Answers
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Is it secure to store passwords as environment variables (rather than as plain text) in config files
I work on a few apps in rails, django (and a little bit of php), and one of the things that I started doing in some of them is storing database and other passwords as environment variables rather than plain text in certain config files (or in settings.py, for django apps).
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Android: Why does long click also trigger a normal click?
I have a ListView with listeners for a long click and a regular click.
4 Answers
4
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Circle-Rectangle collision detection (intersection)
...ith the rectangle:
Either the circle's centre lies inside the rectangle, or
One of the edges of the rectangle has a point in the circle.
Note that this does not require the rectangle to be axis-parallel.
(One way to see this: if none of the edges has a point in the circle (if all the edges a...
Mongo: find items that don't have a certain field
How to search for documents in a collection that are missing a certain field in MongoDB?
2 Answers
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When to use enumerateObjectsUsingBlock vs. for
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Ultimately, use whichever pattern you want to use and comes more naturally in the context.
While for(... in ...) is quite convenient and syntactically brief, enumerateObjectsUsingBlock: has a number of features that may or may not prove interesting:
enumerateObjectsUsingBlock: will ...
Difference Between Invoke and DynamicInvoke
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When you have a delegate instance, you might know the exact type, or you might just know that it is a Delegate. If you know the exact type, you can use Invoke, which is very fast - everything is already pre-validated. For example:
Func<int,int> twice = x => x * 2;
int i = 3;
int j...
When is “i += x” different from “i = i + x” in Python?
...g back on __add__ if it doesn't exist) whereas + calls the __add__ method1 or the __radd__ method in a few cases2.
From an API perspective, __iadd__ is supposed to be used for modifying mutable objects in place (returning the object which was mutated) whereas __add__ should return a new instance ...
HEAD and ORIG_HEAD in Git
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HEAD is (direct or indirect, i.e. symbolic) reference to the current commit. It is a commit that you have checked in the working directory (unless you made some changes, or equivalent), and it is a commit on top of which "git commit" would m...
Set Viewbag before Redirect
Is it possible to set the ViewBag before I call a redirection?
5 Answers
5
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