compare | 易学教程

Compare 2 arrays and list the differences - Swift

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问题 I was wondering how one would go about comparing 2 boolean arrays and listing the non matching booleans. I have written up a simple example of 2 arrays. let array1 = [true, false, true, false] let array2 = [true, true, true, true] How would I compare array1 & array2 and display the non matching. I am trying to do this to check user results for a quiz game. Thanks! 回答1: Here's one implementation, but whether it is the one you are after is completely impossible to say, because you have not

How to compare Enums in Python?

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问题 Since Python 3.4, the Enum class exists. I am writing a program, where some constants have a specific order and I wonder which way is the most pythonic to compare them: class Information(Enum): ValueOnly = 0 FirstDerivative = 1 SecondDerivative = 2 Now there is a method, which needs to compare a given information of Information with the different enums: information = Information.FirstDerivative print(value) if information >= Information.FirstDerivative: print(jacobian) if information >=

Why does isEqualToString not work for NSString?

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问题 I am trying to code the login process for an iPhone app in XCode. The problem is with the NSString serverOutput below. When I print it using printf(serverOutput.UTF8String); it prints 'Yes' to the console. However when I compare serverOutput to "Yes" it doesn't work. Any help would be appreciated. Here's my code: - (IBAction) loginButton: (id) sender { // TODO: spawn a login thread indicator.hidden = FALSE; [indicator startAnimating]; NSString *post =[NSString stringWithFormat:@"username=%@

Check if two NSStrings are similar

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I present a tricky question that I am not sure how to approach. So, I have formulated a plist containing dictionaries which contain two objects: The Country Name The Plug Size Of The Country There are only 210 countries/facts though. And, I have enabled to search through a list of many many countries, in which there might be a fact or not. But here is my problem, I am using a web service called Geonames and the user can use a search bar display controller to search for countries, and these plist country names paired with plug sizes are actually from a Wikipedia article. Now, the country naming

Java, Check if a String is a palindrome. Case insensitive

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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. Use this regex to remove all punctuation and spaces and convert it to lower case String palindrome = "..." //

Why does '$true -eq “string”' returns $true? [duplicate]

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问题 This question already has answers here : Why is $false -eq “” true? (2 answers) Closed 5 years ago . In powerShell you compare a boolean with a string with the "-eq" operator it will always return the same boolean as I used to compare. E.g. $shouldBeFalse = $true -eq "hello" $shouldBeTrue = $false -eq "hello" The variable $shouldBeFalse is $true. The variable $shouldBeTrue is $false. I had to use the "Equals" method: $shouldBeFalse = $true.Equals("hello") In this case $shouldBeFalse is $false

Compare arrays of objects, optimal way

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问题 I have two arrays. In each array I have objects with lots of properties but no methods. I need to see if array 1 is equal with array 2. One way to do that would be to create a function that pass through each element of an array and compare each property of the object with the object in the similar position in the second array. The problem is that the arrays are quite big and also each object has lots of properties. I was wandering if there could be another way. In C++ for example I could read

What is the proper function for comparing two C-style strings?

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So I have a dilemma. I need to compare two C-style strings and I searched for the functions that would be the most appropiate: memcmp //Compare two blocks of memory (function) strcmp //Compare two strings (function ) strcoll //Compare two strings using locale (function) strncmp //Compare characters of two strings (function) strxfrm //Transform string using locale (function) The first one I think is for addresses, so the idea is out. The second one sounds like the best choice to me, but I wanna hear feedback anyway. The other three leave me clueless. For general string comparisons, strcmp is

Compare version strings in groovy

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Hey I have created a Groovy script that will extract the version numbers of some folder. I would then like to compare the version numbers and select the highest. I got my script to run through the dir folder and I then get the versions in this format: 02.2.02.01 So I could get something like this: 02.2.02.01 02.2.02.02 02.2.03.01 I don't have them as a list but like this: baseDir.listFiles().each { file -> def string = file.getName().substring(5, 15) // do stuff } Also I have tested that Groovy could compare them with the > operator and it can! But now I need to select the one with the highest

how to sort an NSArray using compare:options

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问题 I have an NSArray containing numbers as NSString objects. ie. [array addObject:[NSString stringWithFormat:@"%d", 100]]; How do I sort the array numerically? Can I use compare:options and specify NSNumericSearch as NSStringCompareOptions ? Please give me an example/sample code. 回答1: You can use the example code given for the sortedArrayUsingFunction:context: method which should work fine for NSStrings too as they also have the intValue method. // Place this functions somewhere above