coding-style

问题 What is the best style in scala for "advanced iteration" over collection of smth. In which cases I should use for-comprehension and when I should look for alternative way(in terms of style) of iteration. In Programming in Scala book there is an example that looks almost as next one: for{ file <- filesHere if file.getName.endsWith("txt") line <- Source.fromFile(file).getLines.toList if line.trim.matches(pattern) } println("|" + file + ": " + line.trim) I've tried to rewrite it using internal

问题 What is the best style in scala for "advanced iteration" over collection of smth. In which cases I should use for-comprehension and when I should look for alternative way(in terms of style) of iteration. In Programming in Scala book there is an example that looks almost as next one: for{ file <- filesHere if file.getName.endsWith("txt") line <- Source.fromFile(file).getLines.toList if line.trim.matches(pattern) } println("|" + file + ": " + line.trim) I've tried to rewrite it using internal

问题 This question already has answers here : How to break a line of chained methods in Python? (8 answers) Closed 6 years ago . From reading PEP-8, I get it that you should put the closing parenthesis on the same line as the last argument in function calls: ShortName.objects.distinct().filter( product__photo__stockitem__isnull=False) Probably, long expressions are best to avoid at all. But if it's undesirable, how would you go about multiple chained method calls? Should the closing paren be on a

问题 Is there a convention for what file extension is used for template class implementation? **.tpp .template .hpp ** 回答1: "Is there a convention for what file extension is used for template class implementation?" No there isn't really a standard convention established for these file extensions AFAIK. There's a number of file extensions commonly used though, like .icc .inl .tcc (which seems at least to be used by my GCC 4.8.1 standard libraries implementation) ... It doesn't really matter that

问题 Is there a convention for what file extension is used for template class implementation? **.tpp .template .hpp ** 回答1: "Is there a convention for what file extension is used for template class implementation?" No there isn't really a standard convention established for these file extensions AFAIK. There's a number of file extensions commonly used though, like .icc .inl .tcc (which seems at least to be used by my GCC 4.8.1 standard libraries implementation) ... It doesn't really matter that

问题 Related Questions : Benefits of using short-circuit evaluation, Why would a language NOT use Short-circuit evaluation?, Can someone explain this line of code please? (Logic & Assignment operators) There are questions about the benefits of a language using short-circuit code, but I'm wondering what are the benefits for a programmer? Is it just that it can make code a little more concise? Or are there performance reasons? I'm not asking about situations where two entities need to be evaluated

问题 I learned c# recently, so when I learned to write properties, I was taught to do it like this: public string Name { get; set; } Auto properties are great! But now I'm trying to do something a little more complicated, so I need to write a custom pair of accessors. private string _Name; public string Name { get { return _Name; } set { _Name = value } } I know the compiler makes a private instance variable down in it's murky depths when one uses autos, but I'm spoiled and don't want that private

问题 I try to set the background color of a control when mouse is over it. I try to do it via the visual state manager. I was able to get the following code running: <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Control.Background" Storyboard.TargetName="BorderBackground"> <DiscreteObjectKeyFrame KeyTime="0"> <DiscreteObjectKeyFrame.Value> <SolidColorBrush Color="#FF123456" /> </DiscreteObjectKeyFrame.Value> </DiscreteObjectKeyFrame> </ObjectAnimationUsingKeyFrames> But i do not want

问题 I try to set the background color of a control when mouse is over it. I try to do it via the visual state manager. I was able to get the following code running: <ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Control.Background" Storyboard.TargetName="BorderBackground"> <DiscreteObjectKeyFrame KeyTime="0"> <DiscreteObjectKeyFrame.Value> <SolidColorBrush Color="#FF123456" /> </DiscreteObjectKeyFrame.Value> </DiscreteObjectKeyFrame> </ObjectAnimationUsingKeyFrames> But i do not want

问题 I created a code, which have to convert ContentDataType into MIME types. For example - ContentDataType is a simple String like ImageJPEG and now I use MediaType.IMAGE_JPEG_VALUE to convert it into image/jpeg . But I use switch to do this. This is a code: public static String createContentType(ContentDataType contentDataType) { String contentType; switch (contentDataType) { case IMAGE_JPG: contentType = MediaType.IMAGE_JPEG_VALUE; break; //next media types } return contentType; } What is a