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How to count the number of set bits in a 32-bit integer?
... CPU you are on and what your usage pattern is.
Some CPUs have a single built-in instruction to do it and others have parallel instructions which act on bit vectors. The parallel instructions (like x86's popcnt, on CPUs where it's supported) will almost certainly be fastest. Some other architecture...
Percentage Height HTML 5/CSS
I am trying to set a <div> to a certain percentage height in CSS, but it just remains the same size as the content inside it. When I remove the HTML 5 <!DOCTYTPE html> however, it works, the <div> taking up the whole page as desired. I want the page to validate, so what shoul...
How to rename files and folder in Amazon S3?
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I just tested this and it works:
aws s3 --recursive mv s3://<bucketname>/<folder_name_from> s3://<bucket>/<folder_name_to>
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Aggregate / summarize multiple variables per group (e.g. sum, mean)
...data frame, is there a easy way to aggregate ( sum , mean , max et c) multiple variables simultaneously?
8 Answers
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Get a list of resources from classpath directory
...urce names from a given classpath directory, something like a method List<String> getResourceNames (String directoryName) .
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String concatenation in Ruby
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You can do that in several ways:
As you shown with << but that is not the usual way
With string interpolation
source = "#{ROOT_DIR}/#{project}/App.config"
with +
source = "#{ROOT_DIR}/" + project + "/App.config"
The second method seems to be more efficient in term ...
Is there any difference between DECIMAL and NUMERIC in SQL Server?
...rences a column in "NUMERIC(18,0)" format, you will get the error Column '<referencedColumn>' is not the same data type as referencing column '<parentTable>.<parentColumn>' in foreign key '<yourKeyName>'. They have to both be NUMERIC(x,y), or both be DECIMAL(x,y).
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Why does Stream not implement Iterable?
In Java 8 we have the class Stream<T> , which curiously have a method
9 Answers
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Rerender view on browser resize with React
...owDimensions(props) {
const [width, height] = useWindowSize();
return <span>Window size: {width} x {height}</span>;
}
The advantage here is the logic is encapsulated, and you can use this Hook anywhere you want to use the window size.
Using React classes:
You can listen in compon...
Converting a List to a comma separated string
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List<int> list = ...;
string.Join(",", list.Select(n => n.ToString()).ToArray())
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