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Null coalescing in powershell
...shell.
Null Coalescing
$null ?? 100 # Result is 100
"Evaluated" ?? (Expensive-Operation "Not Evaluated") # Right side here is not evaluated
Null Conditional Assignment
$x = $null
$x ??= 100 # $x is now 100
$x ??= 200 # $x remains 100
Ternary Operator
$true ? "this value returne...
How to watch for array changes?
...way to be notified when an array is modified using push, pop, shift or index-based assignment? I want something that would fire an event that I could handle.
...
Force re-download of release dependency using Maven
I'm working on a project with dependency X. X, in turn, depends on Y.
13 Answers
13
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Generate a random point within a circle (uniformly)
...t uniformly in a triangle ABC, where |AB|=|BC|? Let's make this easier by extending to a parallelogram ABCD. It's easy to generate points uniformly in ABCD. We uniformly pick a random point X on AB and Y on BC and choose Z such that XBYZ is a parallelogram. To get a uniformly chosen point in the ori...
Changing UIImage color
...e = <# UIImage #>;// Image to mask with
UIGraphicsBeginImageContextWithOptions(image.size, NO, image.scale);
CGContextRef context = UIGraphicsGetCurrentContext();
[color setFill];
CGContextTranslateCTM(context, 0, image.size.height);
CGContextScaleCTM(context, 1.0, -1.0);
...
How can you determine a point is between two other points on a line segment?
...o dimensional plane with 2 points (called a and b) on it represented by an x integer and a y integer for each point.
20 Ans...
Counting the number of elements with the values of x in a vector
... a great point. These are all integers, so it isn't a real issue in this example, right?
– Shane
Dec 17 '09 at 18:18
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convert a list of objects from one type to another using lambda expression
...producing a list of objects of a different type. I was told that a lambda expression can achieve the same result.
13 Answer...
What is the best (idiomatic) way to check the type of a Python variable? [duplicate]
...se collections.Mapping instead of dict as per the ABC PEP.
def value_list(x):
if isinstance(x, dict):
return list(set(x.values()))
elif isinstance(x, basestring):
return [x]
else:
return None
...
RE error: illegal byte sequence on Mac OS X
I'm trying to replace a string in a Makefile on Mac OS X for cross-compiling to iOS. The string has embedded double quotes. The command is:
...