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Rails filtering array of objects by attribute value
...html#method-i-partition
– Vlad
Jun 20 '16 at 21:04
Thanks @Vlad, thats cool, but it support only if we need to collect...
Alter Table Add Column Syntax
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edited Apr 27 '09 at 17:02
Eoin Campbell
39.5k1717 gold badges9292 silver badges149149 bronze badges
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How to count certain elements in array?
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Very simple:
var count = 0;
for(var i = 0; i < array.length; ++i){
if(array[i] == 2)
count++;
}
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improve this answer
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How to break out of a loop in Bash?
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It's not that different in bash.
done=0
while : ; do
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if [ "$done" -ne 0 ]; then
break
fi
done
: is the no-op command; its exit status is always 0, so the loop runs until done is given a non-zero value.
There are many ways you could set and te...
Does .NET have a way to check if List a contains all items in List b?
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answered Oct 5 '09 at 15:06
Jon SkeetJon Skeet
1211k772772 gold badges85588558 silver badges88218821 bronze badges
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What is android:weightSum in android, and how does it work?
...tent"
android:layout_weight="1"
android:layout_width="0dp"/>
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weightSum is useful for having the layout rendered correctly for any device, which will not happen if you set width and height directly.
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What differences, if any, between C++03 and C++11 can be detected at run-time?
...le to write a function, which, when compiled with a C compiler will return 0, and when compiled with a C++ compiler, will return 1 (the trivial sulution with
#ifdef __cplusplus is not interesting).
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targetContentOffsetForProposedContentOffset:withScrollingVelocity without subclassing UICollectionVi
...m I have this...
- (void)awakeFromNib
{
self.itemSize = CGSizeMake(75.0, 75.0);
self.minimumInteritemSpacing = 10.0;
self.minimumLineSpacing = 10.0;
self.scrollDirection = UICollectionViewScrollDirectionHorizontal;
self.sectionInset = UIEdgeInsetsMake(10.0, 10.0, 10.0, 10.0);
}
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Script parameters in Bash
...n the variables $1 and $2 and $3 where the number refers to the argument. $0 is the command itself.
The arguments are seperated by spaces, so if you would provide the -from and -to in the command, they will end up in these variables too, so for this:
./ocrscript.sh -from /home/kristoffer/test.png ...
Read and overwrite a file in Python
...ilename, 'r+')
text = f.read()
text = re.sub('foobar', 'bar', text)
f.seek(0)
f.write(text)
f.truncate()
f.close()
The functionality will likely also be cleaner and safer using open as a context manager, which will close the file handler, even if an error occurs!
with open(filename, 'r+') as f:
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