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How to emulate C array initialization “int arr[] = { e1, e2, e3, … }” behaviour with std::array?
...e directly initialized.)
This question discusses the uses left for a C array like int arr[20]; . On his answer , @James Kanze shows one of the last strongholds of C arrays, it's unique initialization characteristics:
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Usage of protocols as array types and function parameters in swift
...conforming to a certain protocol. The objects should be stored in a typed array. According to the Swift documentation protocols can be used as types:
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How do I remove a file from the FileList
...ers with using FileList.
It would be convenient to treat a FileList as an array, but methods like sort, shift, pop, and slice don't work. As others have suggested, you can copy the FileList to an array. However, rather than using a loop, there's a simple one line solution to handle this conversion....
Saving a Numpy array as an image
I have a matrix in the type of a Numpy array. How would I write it to disk it as an image? Any format works (png, jpeg, bmp...). One important constraint is that PIL is not present.
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Sorting arraylist in alphabetical order (case insensitive)
I have a string arraylist names which contains names of people. I want to sort the arraylist in alphabetical order.
8 Ans...
Why is using “for…in” for array iteration a bad idea?
I've been told not to use for...in with arrays in JavaScript. Why not?
27 Answers
27...
What is the Ruby (spaceship) operator?
...if a and b are not comparable then return nil
It's useful for sorting an array.
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How do I initialize an empty array in C#?
Is it possible to create an empty array without specifying the size?
13 Answers
13
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Ruby - test for array
...kind_of().
>> s = "something"
=> "something"
>> s.kind_of?(Array)
=> false
>> s = ["something", "else"]
=> ["something", "else"]
>> s.kind_of?(Array)
=> true
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How to concatenate strings of a string field in a PostgreSQL 'group by' query?
... 8.4 or later:
PostgreSQL 8.4 (in 2009) introduced the aggregate function array_agg(expression) which concatenates the values into an array. Then array_to_string() can be used to give the desired result:
SELECT company_id, array_to_string(array_agg(employee), ', ')
FROM mytable
GROUP BY company_id...