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Is there a way to pass optional parameters to a function?

Is there a way in Python to pass optional parameters to a function while calling it and in the function definition have some code based on "only if the optional parameter is passed" ...
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Failed to execute 'btoa' on 'Window': The string to be encoded contains characters outside of the La

The error in the title is thrown only in Google Chrome, according to my tests. I'm base64 encoding a big XML file so that it can be downloaded: ...
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Is it possible to make a type only movable and not copyable?

...reface: This answer was written before opt-in built-in traits—specifically the Copy aspects—were implemented. I've used block quotes to indicate the sections that only applied to the old scheme (the one that applied when the question was asked). Old: To answer the basic question, you can a...
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Performance surprise with “as” and nullable types

I'm just revising chapter 4 of C# in Depth which deals with nullable types, and I'm adding a section about using the "as" operator, which allows you to write: ...
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What's the point of map in Haskell, when there is fmap?

Everywhere I've tried using map , fmap has worked as well. Why did the creators of Haskell feel the need for a map function? Couldn't it just be what is currently known as fmap and fmap could be removed from the language? ...
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What is the difference between concurrency and parallelism?

What is the difference between concurrency and parallelism? 37 Answers 37 ...
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What is the difference between named and positional parameters in Dart?

... Dart has two types of optional parameters: named and positional. Before I discuss the differences, let me first discuss the similarities. Dart's optional parameters are optional in that the caller isn't required to specify a value for the...
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Best way to get child nodes

I was wondering, JavaScript offers a variety of methods to get the first child element from any element, but which is the best? By best, I mean: most cross-browser compatible, fastest, most comprehensive and predictable when it comes to behaviour. A list of methods/properties I use as aliases: ...
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Is there a constraint that restricts my generic method to numeric types?

Can anyone tell me if there is a way with generics to limit a generic type argument T to only: 21 Answers ...
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How to un-submodule a Git submodule?

...oduling a Git submodule, bringing all the code back into the core repository? 12 Answers ...