code-design

来源： https://stackoverflow.com/questions/17815268/python-efficiently-split-currency-sign-and-number-in-one-string

来源： https://stackoverflow.com/questions/17815268/python-efficiently-split-currency-sign-and-number-in-one-string

问题 I noticed that UnderScoreJS has a lot of wrapper functions around native Javascript functions. Take for example: _.isArray, _.isBoolean, _.isNaN? Is there any reason for this? Or are these simply meant for ensuring code consistency when using an underscoreJS library OR just enhancing these functions in anyway? For example, the _.isArray function gets down to this: _.isArray = nativeIsArray || function(obj) { return toString.call(obj) === '[object Array]'; }; Any idea? 回答1: It's because those

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . Are there any valid reasons why there isn't an overload of the String.Split which accepts a delimiter string and a text to be split?

问题 But I don't know if I should go for static methods, just a header, a class, or something else? What would be best practice? But, I don't want to have an instance of a utility class. I want to add functions like: Uint32 MapRGB (int r, int g, int b); const char* CopyString(const char* char); // etc. You know: utility methods... 回答1: Don't put them in a class; just make them non-member functions at namespace scope. There's no rule that says every function has to be a member function of some

问题 Each time I'm writing a method that takes a boolean parameter representing an option, I find myself thinking: "should I replace this by an enum which would make reading the method calls much easier?". Consider the following with an object that takes a parameter telling whether the implementation should use its thread-safe version or not (I'm not asking here if this way of doing this is good design or not, only the use of the boolean): public void CreateSomeObject(bool makeThreadSafe);

问题 I have my REST API that expose a resource made of some readonly fields. These fields are calculated automatically from the system and exposed in the JSON representation, and they are part of a domain entity . I've succed in this using the framework ( JacksonMapper ) annotation on the method that calculate the result, like: @JsonProperty public boolean isAnonymous(){ //some logic return result; } Untill these resource are used for read purpose, everything it's ok, the problems rise when I have

问题 I have two very similar loops, and these two contain an inner loop that is very similar to a third loop (eh... :) ). Illustrated with code it looks close to this: # First function def fmeasure_kfold1(array, nfolds): ret = [] # Kfold1 and kfold2 both have this outer loop for train_index, test_index in KFold(len(array), nfolds): correlation = analyze(array[train_index]) for build in array[test_index]: # <- All functions have this loop # Retrieved tests is calculated inside the build loop in

问题 I am using a Singleton instance created out of a nested class. This instance holds some static collections which are cleared when the Singleton is disposed, but the problem is I get a reference to non-null disposed Singleton which is not properly garbage collected. I would like to know WHEN and HOW to completely dispose and garbage collect my Singleton instance so that when the instance is queried again after dispose (and setting to null) a new Instance is created. I am using the following

问题 Here is a problem statement: We have interfaces/super classes Student and Teacher Student has two implementations/sub clasees, ScienceStudent and PhysicalEducationStudent Teacher has ScienceTeacher and PhysicalEducationTeacher. We want to implement a method getMeetingPoint(Student s, Teacher t) which returns a place where they meet based on the type of Student and Teacher. For example, if its a ScienceStudent and ScienceTeacher they meet at Lab if PEStudent and PETeacher they meet on the