comparison

问题 I'm trying to compare two Actions. The comparison with == always returns false as does the Equals-method even though it's the same instance. My question is: Is it really not possible or am I doing it wrong? Cheers AC 回答1: You are doing it wrong. If I am to believe you, when you say "even though it's the same instance", then the following code executed through LINQPad tells me that you must be doing something wrong, or the "same instance" is incorrect: void Main() { Action a = () => Debug

问题 I'm trying to compare two Actions. The comparison with == always returns false as does the Equals-method even though it's the same instance. My question is: Is it really not possible or am I doing it wrong? Cheers AC 回答1: You are doing it wrong. If I am to believe you, when you say "even though it's the same instance", then the following code executed through LINQPad tells me that you must be doing something wrong, or the "same instance" is incorrect: void Main() { Action a = () => Debug

问题 I'm trying to compare two Actions. The comparison with == always returns false as does the Equals-method even though it's the same instance. My question is: Is it really not possible or am I doing it wrong? Cheers AC 回答1: You are doing it wrong. If I am to believe you, when you say "even though it's the same instance", then the following code executed through LINQPad tells me that you must be doing something wrong, or the "same instance" is incorrect: void Main() { Action a = () => Debug

问题 This is an extremely basic question, I know, but I couldn't understand what's going on from Google and Stack Overflow. I looked here and here to learn how to compare strings in JavaScript. Neither mentioned triple equals ( === ) in their answers, and said that it's better to use your own function ( str1 < str2 ? -1 : str1 > str2 ). However, going through explanations about === in Stack Overflow (here and here), the answers contain string comparisons. From what I saw in those answers, === does

问题 Surprise! I've a variable like this, NSInteger index = 0; I'm comparing it with one of subviews count (which returns NSUInteger ) like this, if((index-1) <= [[currentmonth subviews] count]) { NSLog(@"true"); } else { NSLog(@"false"); } This always giving false. but If I'll do like this, if ((index-1) <= 42) { NSLog(@"true"); } else { NSLog(@"false"); } This always giving true. I feel that, this because we can't compare NSInteger with NSUInteger correct? I caught this issue, when I have a

问题 I want to create a function that takes as parameters: An array filled of coordinates The current user location And return the closest location between the user's location and the array locations. Here are my locations: let coord1 = CLLocation(latitude: 52.45678, longitude: 13.98765) let coord2 = CLLocation(latitude: 52.12345, longitude: 13.54321) let coord3 = CLLocation(latitude: 48.771896, longitude: 2.270748000000026) User location function: func locationManager(_ manager: CLLocationManager

问题 I have two text files g1.txt alfa beta;www.google.com Light Dweller - CR, Technical Metal;http://alfa.org;http://beta.org;http://gamma.org; g2.txt Jack to ride.zip;http://alfa.org; JKr.rui.rar;http://gamma.org; Nofj ogk.png;http://gamma.org; I use this command to run my awk script awk -f ./join2.sh g1.txt g2.txt > "g3.txt" and I obtain this output Light Dweller - CR, Technical Metal;http://alfa.org;http://beta.org;http://gamma.org;;Jack to ride.zip;http://alfa.org;JKr.rui.rar;http://gamma.org

问题 I have two text files g1.txt alfa beta;www.google.com Light Dweller - CR, Technical Metal;http://alfa.org;http://beta.org;http://gamma.org; g2.txt Jack to ride.zip;http://alfa.org; JKr.rui.rar;http://gamma.org; Nofj ogk.png;http://gamma.org; I use this command to run my awk script awk -f ./join2.sh g1.txt g2.txt > "g3.txt" and I obtain this output Light Dweller - CR, Technical Metal;http://alfa.org;http://beta.org;http://gamma.org;;Jack to ride.zip;http://alfa.org;JKr.rui.rar;http://gamma.org

问题 I have two text files g1.txt alfa beta;www.google.com Light Dweller - CR, Technical Metal;http://alfa.org;http://beta.org;http://gamma.org; g2.txt Jack to ride.zip;http://alfa.org; JKr.rui.rar;http://gamma.org; Nofj ogk.png;http://gamma.org; I use this command to run my awk script awk -f ./join2.sh g1.txt g2.txt > "g3.txt" and I obtain this output Light Dweller - CR, Technical Metal;http://alfa.org;http://beta.org;http://gamma.org;;Jack to ride.zip;http://alfa.org;JKr.rui.rar;http://gamma.org

问题 In Python 2, it was possible to compare objects of different types such as int to str by having an implicit comparison of the text string of types (that is, in lexicographic order, string 'int' is less than string 'str' and string 'list' is less than string 'tuple' ). Hence, in Python 2, 5 < 'hello' returns True . One can read more about why this was allowed in answer to Why is ''>0 True in Python?. In Python 3, this raises builtins.TypeError: unorderable types: int() < str() exception. This