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What is the difference between the GNU Makefile variable assignments =, ?=, := and +=?
Can anybody give a clear explanation of how variable assignment really works in Makefiles.
6 Answers
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asp.net mvc: why is Html.CheckBox generating an additional hidden input
I just noticed that Html.CheckBox("foo") generates 2 inputs instead of one, anybody knows why is this so ?
10 Answers
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In Python, how do I create a string of n characters in one line of code?
...haracters in Python. Is there a one line answer to achieve this with the existing Python library? For instance, I need a string of 10 letters:
...
What's the point of map in Haskell, when there is fmap?
...ical purposes has been part of the Haskell community since before Haskell existed, cf. A History of Haskell, so the comment in question is not in any way second-hand hearsay!
– C. A. McCann
Jul 26 '11 at 21:37
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.NET console application as Windows service
...t which could run as console application or as windows service if run for example from command line using switches.
10 Ans...
What is the most efficient way to concatenate N arrays?
...e way to go for convenience and likely performance.
var a = [1, 2], b = ["x", "y"], c = [true, false];
var d = a.concat(b, c);
console.log(d); // [1, 2, "x", "y", true, false];
For concatenating just two arrays, the fact that push accepts multiple arguments consisting of elements to add to the ar...
How to save all the variables in the current python session?
...ew
for key in dir():
try:
my_shelf[key] = globals()[key]
except TypeError:
#
# __builtins__, my_shelf, and imported modules can not be shelved.
#
print('ERROR shelving: {0}'.format(key))
my_shelf.close()
To restore:
my_shelf = shelve.open(filename)...
O(nlogn) Algorithm - Find three evenly spaced ones within binary string
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1
2
Next
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psql: could not connect to server: No such file or directory (Mac OS X)
...atabase. (PostgreSQL should delete it automatically if the postmaster has exited.).
SOLUTION: This fixed the issue--I deleted this file, and then everything worked!
/usr/local/var/postgres/postmaster.pid
--
and here is how I figured out why this needed to be deleted.
I used the following com...
Android Camera Preview Stretched
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Camera.Size optimalSize = null;
double minDiff = Double.MAX_VALUE;
int targetHeight = h;
for (Camera.Size size : sizes) {
double ratio = (double) size.width / size.height;
if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE) continue;
...