Developer FAQs | Developer Questions And Answers

how do I select only the odd or even variables that used in a for loop?

here's my JS code:I'm wondering how to select only the odd or even i'sUse Array operation mapOr simple loop

04月30日发表评论

Is there a system call function whose definition calls another system call function?

In Linux, is there a system call function whose definition calls another system call function? Or are all the system call functions exclusive to each other in the sense that any system call function doesn't call another system call function?

04月30日发表评论

Changing a string iteratively

I am trying to write in Python a script that takes a string and returns a list of string by iteratively moves the letters in the original sequence.

04月30日发表评论

Check if value tuple is default

How to check if a System.ValueTuple is default? Rough example:I can return a default value in MyMethod using default syntax of C# 7.2. I cannot check for default case back? These are what I tried:

04月30日发表评论

Why does Requests have a cake in version.py?

While browsing the GitHub repository for the Python Requests library, I noticed there was a strange __cake__ variable at the bottom of requests/__version__.py.

04月30日发表评论

Convert a std::vector<boost::optional<double>> to a std::vector<double>

I have a std::vector<boost::optional<double>>, foo say. In this particular instance I need a std::vector<double> where any "optional" element in the other vector maps to a 0 in the new one.

04月30日发表评论

How to combine back_inserter with a transformation, C++

How can I wrap an OutputIterator such as back_inserter_iterator with a transformation? ConsiderI would like to apply a free function f(double) or g(std::vector<double>::iterator) before pushing back to the diff vector:

04月30日发表评论

why let keyword does not work with eval() [duplicate]

This question already has an answer here:This works just fine, but when we use let instead of var, it does not work. Why?

04月30日发表评论

java lambda method and new Object

I have the following code:which printsI don't know why the code does not print run when calling runnable.run();. Can you tell me why that happens?

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Array.prototype.splice – help to understand a lesson

Here is a function from a tutorial:SOURCEAnd the expression Array.prototype.splice.call(arguments, [1]) confuses me.

04月30日发表评论