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How to get all possible combinations of a list’s elements?
I have a list with 15 numbers in, and I need to write some code that produces all 32,768 combinations of those numbers.
27...
Why does the Scala compiler disallow overloaded methods with default arguments?
While there might be valid cases where such method overloadings could become ambiguous, why does the compiler disallow code which is neither ambiguous at compile time nor at run time?
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Split comma-separated strings in a column into separate rows
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This old question frequently is being used as dupe target (tagged with r-faq). As of today, it has been answered three times offering 6 different approaches but is lacking a benchmark as guidance which of the approaches is the fastest1.
The benchmarked so...
MySQL: Quick breakdown of the types of joins [duplicate]
I would like a quick breakdown of the types of MySQL joins. I know of these, the rest I am not sure what they mean.
3 Answe...
Difference between InvariantCulture and Ordinal string comparison
When comparing two strings in c# for equality, what is the difference between InvariantCulture and Ordinal comparison?
9 An...
Converting file size in bytes to human-readable string
I'm using this function to convert a file size in bytes to a human-readable file size:
19 Answers
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What issues should be considered when overriding equals and hashCode in Java?
What issues / pitfalls must be considered when overriding equals and hashCode ?
11 Answers
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Modifying a subset of rows in a pandas dataframe
Assume I have a pandas DataFrame with two columns, A and B. I'd like to modify this DataFrame (or create a copy) so that B is always NaN whenever A is 0. How would I achieve that?
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Why have header files and .cpp files? [closed]
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Well, the main reason would be for separating the interface from the implementation. The header declares "what" a class (or whatever is being implemented) will do, while the cpp file defines "how" it will perform those features.
This reduces dependenc...
Cartesian product of multiple arrays in JavaScript
...nilla JS
Original 2017 Answer: 2-line answer with vanilla JS:
(see updates below)
All of the answers here are overly complicated, most of them take 20 lines of code or even more.
This example uses just two lines of vanilla JavaScript, no lodash, underscore or other libraries:
let f = (a, b) => []...