coding-style

问题 From where can I get complete set of Indentation rules for Haskell code writing? Past SO questions which are similar to my following question has led me to ask above question. What are the reasons behind the error message: parse error on input 'something' ? Error message I got: baby.hs:103:2: parse error on input `myList'(error in this line) Code I am trying to compile: myList = ["aeroplane", "Aeroplane", "AeRoPlAne", "helicopter", "HELICOPTER", "Zebra"] quicksort :: (Ord a) => [a] -> [a]

问题 Is it valuable for using Integer i = NumberUtils.INTEGER_ONE instead of Integer i = 1 ? I don't know what happen behind auto boxing. Thanks 回答1: Basically it will be compiled into: Integer i = Integer.valueOf(NumberUtils.INTEGER_ONE); assuming INTEGER_ONE is declared as an int . At execution time, assuming INTEGER_ONE has the value 1, that will actually return a reference to the same object each time, guaranteed by the Java Language Specification, because it's in the range -128 to 127. Values

问题 A number of features were introduced into C# 3.0 which made me uneasy, such as object initializers, extension methods and implicitly typed variables. Now in C# 4.0 with things like the dynamic keyword I'm getting even more concerned. I know that each of these features CAN be used in appropriate ways BUT in my view they make it easier for developers to make bad coding decisions and therefore write worse code. It seems to me that Microsoft are trying to win market share by making the coding

问题 I just installed Reshaper 4.5 and it has come up with the following suggestions: return this.GetRuleViolations().Count() == 0; -- REMOVE this. new string[] { this.ID.ToString(), this.Registration } -- REMOVE string, MAKE ANONYMOUS TYPE int i = Method.GetNumber(); -- REPLACE int WITH var Should I do these? I think in some cases it is going to make the code less readable but will it improve performance? what are the benefits of making these changes? Thanks 回答1: 1) The explicit this pointer is

问题 Options A: if (NULL == pSomethingColumn) // Yes, we use Yoda conditions if (NULL != pSomethingColumn) Or if (pSomethingColumn) if (!pSomethingColumn) I am looking for references explaining the reasoning as well. I have heard some people say that technically NULL does not have to be defined as 0 , but come on! if that was the case, then the sucker (our app) would crash in -2147483648 different ways. So, if NULL != 0 , then we will have big problems. Please help me settle a pointless syntax

问题 Declaring a struct with typedef typedef struct some_struct { int someValue; } *pSomeStruct; and then passing it as a parameter to some function with const declaration, implying 'const some_struct * var' void someFunction1( const pSomeStruct var ) turns out to become some_struct * const var This is also stated in Section 6.7.5.1 of the ISO C standard which states that 'const' in this case applies to the pointer and not to the data to which it points. So the question is - is there a way to

问题 In Haskell, I often write expressions with $'s. I find it quite natural and readable, but I sometimes read it is bad form and do not understand why it should be. 回答1: The following are all good form: foo = bar . baz . quux foo x = bar . baz . quux $ x foo x = (bar . baz . quux) x foo x = bar (baz (quux x)) I've put them in rough order of my preference, though as always taste varies, and context may demand a different choice. I've also occasionally seen foo = bar . baz . quux when each of the

问题 In my project I have a shapes package which has shapes I designed for my graphics program e.g Rectangle, Circle. I also have one or two more packages that have the same names as java.awt classes. Now, since I do not want to rename every class in my code-base, to show my source files which class I mean when I , say, declare a new Rectangle, I need to either: 1- import the rectangle class explicitly, i.e import shapes.Rectangle OR 2- import only the java.awt classes I need and not import java

问题 Is there a way to specify getting all but the first element in an array? I generally use foreach() to loop through my arrays. say array(1,2,3,4,5), i would only want 2, 3, 4 ,5 to show and for it to skip 1. 回答1: There are multiple ways of approaching this problem. The first solution is to use a flag boolean to indicate the first element and proceed in your foreach $firstElement = true; foreach($array as $key => $val) { if($firstElement) { $firstElement = false; } else { echo "$key => $val\n";

问题 I wanted to see the source code of a real world application to understand good programming practices etc. So I chose Git and downloaded the source for version 1.8.4. After randomly browsing through various files something caught my attention in these two files: strbuf.h strbuf.c These two files apparently define an API with this documentation. I have two questions : Why the function declarations at line 16,17,18,19 & global variable at line 6 in 'strbuf.h' declared extern ? Why "strbuf.h" is