compare

问题 I want to compare 2 BOOL values in objective-c. I found out that (3)-(6) of the following code works. (1)-(2) doesn't work because BOOL is just signed char . (3) works and is very readable but I think bool isn't objective-c. Using bool in objective-c code is good? Which is the safe and good way to compare 2 BOOL values in objective-c? Are there other better ways to compare? BOOL b = YES; BOOL c = 2; NSLog(@"(1) %d", b == c); // not work NSLog(@"(2) %d", (BOOL)b == (BOOL)c); // not work NSLog(

问题 I have two JavaScript arrays ( A and B ) that contain objects that I created. I want to check that all the objects in array A are contained in array B , but not necessarily in the same order. What is the best way to do this? Edit: They are all actual objects, not primitives, so I will need to compare their contents and structure as well (maybe using something like JSON.stringify ). I want to do this because I'm learning Test-Driven Development, and I want to test functions that return lists

问题 I would like to know why the expression given in the title [] == ![] is evaluated to true . You cannot compare arrays as strings. I get that. If [] == [] will evaluate to false because the references are different. Though if we have the following statement. var arr = []; arr == arr // this evaluates to true simply because references are the same. In order A == B to return true either A and B have to be false or true . A == !B in order to return true A can be true and B can be false or vice

问题 I want to write a java method to return true if a string is a palindrome. Here is what I have so far: String palindrome = "..."; boolean isPalindrome = palindrome.equals( new StringBuilder(palindrome).reverse().toString()); My problem with this is that it does not consider a word like: Race car to be a palindrome. Doc, note, I dissent. A fast never prevents a fatness. I diet on cod. What is the best way to test if this is a palindrome, with case insensitivity and ignoring punctuation. 回答1:

问题 I thought that if I used operators such as ">" and "<" in c++ to compare strings, these would compare them lexicographically, the problem is that this only works sometimes in my computer. For example if("aa" > "bz") cout<<"Yes"; This will print nothing, and thats what I need, but If I type if("aa" > "bzaa") cout<<"Yes"; This will print "Yes", why is this happening? Or is there some other way I should use to compare strings lexicographically? 回答1: Comparing std::string -s like that will work.

问题 When you call remove(object o) on an arraylist in java, how does it compare the objects to find the correct one to remove? does it use the pointer? or does it compare the objects using the interface Comparable? 回答1: ArrayList remove() relies on the objects implementation of the Equal method. If no implementation has been done then the object is removed by Object 's implementation of Equals which indeed is the pointer comparison. From the documentation on ArrayList - More formally, removes the

问题 Let's say we have DateTime t1 = DateTime.Parse("2012/12/12 15:00:00.000"); and DateTime t2 = DateTime.Parse("2012/12/12 15:03:00.000"); How to compare it in C# and say which time is "is later than"? 回答1: You can use the TimeOfDay property and use the Compare against it. TimeSpan.Compare(t1.TimeOfDay, t2.TimeOfDay) Per the documentation: -1 if t1 is shorter than t2. 0 if t1 is equal to t2. 1 if t1 is longer than t2. 回答2: The < , <= , > , >= , == operators all work directly on DateTime and

问题 This question already has answers here : Bash If-statement to check If string is equal to one of several string literals (2 answers) Closed last month . i have the following piece of bashscript: function get_cms { echo "input cms name" read cms cms=${cms,,} if [ "$cms" != "wordpress" && "$cms" != "meganto" && "$cms" != "typo3" ]; then get_cms fi } But no matter what i input (correct and incorrect values) it never calls the function again, because I only want to allow 1 of those 3 inputs. I

问题 PowerShell noob here. I have two different folders with xml files. One folder (folder2) contains updated and new xml files compared to the other (folder1). I need to know which files in folder2 are new/updated compared to folder1 and copy them to a third folder (folder3). What's the best way to accomplish this in PowerShell? 回答1: OK, I'm not going to code the whole thing for you (what's the fun in that?) but I'll get you started. First, there are two ways to do the content comparison. The

问题 PowerShell noob here. I have two different folders with xml files. One folder (folder2) contains updated and new xml files compared to the other (folder1). I need to know which files in folder2 are new/updated compared to folder1 and copy them to a third folder (folder3). What's the best way to accomplish this in PowerShell? 回答1: OK, I'm not going to code the whole thing for you (what's the fun in that?) but I'll get you started. First, there are two ways to do the content comparison. The