comparison

问题 I trying to write a programm for file compare. For example: file1 1 2 3 4 5 file2 1 2 @ 3 4 5 If I do it line by line, I get: 1 == 1; 2 == 2; 3 != @; 4 != 3; 5 != 4; != 5; But, the truth is that the only difference between the files is @. I want get something like this: 1 == 1; 2 == 2; != @; 3 == 3; 4 == 4; 5 == 5; Which is the best way to do it? without using any external application, such as diff, fc, etc. 回答1: Python has a very handy library for comparing sequences called difflib. The

问题 I need a bag/multiset-like data type in Python. I understand collections.Counter is often used for this purpose. But the comparison operators don't seem to work: In [1]: from collections import Counter In [2]: bag1 = Counter(a=1, b=2, c=3) In [3]: bag2 = Counter(a=2, b=2) In [4]: bag1 > bag2 Out[4]: True This seems like a bug to me. I expected the less-than and greater-than operators to perform set-like subset and superset comparisons. But if that were the case then bag1 > bag2 would be false

问题 The following comparisons all return false in javascript: []===[] []==[] {}==={} {}=={} [0]===[0] [0]==[0] However the following return true : [0]=='0' [0]==0 []==false //(and all other == that were exampled above) What is the reason for this? Especially the difference between [0]!=[0] and [0]==0 Fiddle: http://jsfiddle.net/vnBVj/ 回答1: This is due to the confusing rules, how javascript does type coercion. You can read about this in §11.9.3 of the EcmaScript 5 spec. Two Objects (which Arrays

问题 To be specific, I have two lists: List<SystemUserWithNameAndId> list1; List<SystemUserWithNameAndId> list2; I want to check if they contain the same system users and ordering is not an issue. I tried to use a comparator to sort them first and then check if they're equal using the equals() method of lists. But I don't want to override the equals method for SystemUserWithNameAndId and I was wondering if I could use the comparator I created for sorting or a similar one to check for equality

问题 I'm using a selector to get a group of objects (0 or more): var $openMenus = $Triggers.filter(".trigger-hover"); Then I have an event attached to an item that may or may not be in the object above. Within that event where I want to compare the item that triggers the event to c $([selector]) .focus(function(){ var $thisMenu = $(this); $openMenus.each(function(){ if ($(this) != $thisMenu ){ [do something] } }) }) This will not work. While multiple jQuery objects may REFER to the same DOM object

问题 This question already has an answer here : How to compare a char property in EL (1 answer) Closed 3 years ago . I want to do something like this: <c:if test="${somestring.charAt(0)=='1'}"> tadaaaam </c:if> when somestring is "11011" but it doesn't work. I can print it with ${somestring.charAt(0)} and it is '1' but comparison above fails. The following comparison: if(somestring.charAt(0)=='1') worx (condition is true) in pure Java. Any ideas? 回答1: EL seems to have trouble with char. Here is

问题 unsigned int i; for (i = 100; i <= 0; --i) printf("%d\n",i); 回答1: Should be i >= 0 in the second condition in the loop if you want it to loop from 100 to 0. That, and as others have pointed out, you'll need to change your definition of i to a signed integer (just int ) because when the counter is meant to be -1, it will be some other positive number because you declared it an unsigned int . 回答2: Since i is unsigned, it will never be less than zero. Drop unsigned . Also, swap the <= for >= .

问题 I have a simple problem that I'm having trouble thinking around: var oldValues : Array = [ 4, 5, 6 ]; var newValues : Array = [ 3, 4, 6, 7 ]; I want to get the values from newValues that aren't in oldValues - 3, 7 I want to get the values from oldValues that aren't in newValues - 5 A way of getting both sets of values together would be nice as well - 3, 5, 7 I can only think of convoluted methods for each by using nested loops that do a lot of redundant checking. Can someone suggest something

问题 The script has to verify if one predefined IP is present in a big array of IPs. Currently I code that function like this (saying that "ips" is my array of IP and "ip" is the predefined ip) ips.each do |existsip| if ip == existsip puts "ip exists" return 1 end end puts "ip doesn't exist" return nil Is there a faster way to do the same thing? Edit : I might have wrongly expressed myself. I can do array.include? but what I'd like to know is : Is array.include? the method that will give me the

问题 Update* I am so sorry... my sample code contained an error which resulted in a lot of answers I didn't understand. In stead of Console.WriteLine("3. this.Equals " + (go1.Equals(go2))); I meant to write Console.WriteLine("3. this.Equals " + (go1.Equals(sb2))); I'm trying to figure out how I can successfully determine if two generic type values are equal to each other. Based on Mark Byers' answer on this question I would think I can just use value.Equals() where value is a generic type. My