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What is the difference between the GNU Makefile variable assignments =, ?=, := and +=?
...bar"
When you use VARIABLE := value, you get the value of value as it is now. For example:
VAL = foo
VARIABLE := $(VAL)
VAL = bar
# VAL will evaluate to "bar", but VARIABLE will evaluate to "foo"
Using VARIABLE ?= val means that you only set the value of VARIABLE if VARIABLE is not set already...
How do I wrap a selection with an HTML tag in Visual Studio?
...
I know this is old and you have probably found the answer by now but I would just like to add for the sake of those who might not know it that this is possible in VS 2010:
Select the code you would like to surround.
Do ctrl-k ...
Creating multiline strings in JavaScript
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ES6 Update:
As the first answer mentions, with ES6/Babel, you can now create multi-line strings simply by using backticks:
const htmlString = `Say hello to
multi-line
strings!`;
Interpolating variables is a popular new feature that comes with back-tick delimited strings:
const htmlStri...
Handling JSON Post Request in Go
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Thanks! I see where I was going wrong now. If you call req.ParseForm(), which I was doing in earlier attempts of trying to solve this problem, before you try and read the req.Body, it seems to clear the body out and unexpected end of JSON input is thrown when you...
What is the 'new' keyword in JavaScript?
...h value 'second'
// returns 'second'
It's like class inheritance because now, any objects you make using new ObjMaker() will also appear to have inherited the 'b' property.
If you want something like a subclass, then you do this:
SubObjMaker = function () {};
SubObjMaker.prototype = new ObjMaker...
Create Generic method constraining T to an Enum
...None -> defaultValue
This one is easier to maintain since it's a well-known language with full Visual Studio IDE support, but you still need a separate project in your solution for it. However, it naturally produces considerably different IL (the code is very different) and it relies on the FSha...
diff current working copy of a file with another branch's committed copy
...branch. I switched to bar branch and made some changes to foo . How can I now run a git diff between this copy (which isn't committed yet) and the copy of the master branch?
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Running a cron every 30 seconds
...to enable the timer (not the service though) by running systemctl enable --now helloworld.timer (the --now flag also starts the timer immediately, otherwise, it will only start after the next boot, or user login).
The [Timer] section fields used here are as follows:
OnBootSec - start the service ...
How many constructor arguments is too many?
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I know this as the "Named Parameter Idiom": parashift.com/c++-faq-lite/ctors.html#faq-10.18. Related: There is also the "Named Constructor Idiom": parashift.com/c++-faq-lite/ctors.html#faq-10.8
– Frank
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How to use glOrtho() in OpenGL?
... and z are in [-1, +1]
ignore the z component and take only x and y, which now can be put into a 2D screen
With glOrtho, z is ignored, so you might as well always use 0.
One reason you might want to use z != 0 is to make sprites hide the background with the depth buffer.
Deprecation
glOrtho is ...