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How to know if two arrays have the same values

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问题 I have these two arrays: one is filled with information from an ajax request and another stores the buttons the user clicks on. I use this code (I filled with sample numbers): var array1 = [2, 4]; var array2 = [4, 2]; //It cames from the user button clicks, so it might be disordered. array1.sort(); //Sorts both Ajax and user info. array2.sort(); if (array1==array2) { doSomething(); }else{ doAnotherThing(); } But it always gives false , even if the two arrays are the same, but with different

Compare two dates in Java

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问题 I need to compare two dates in java. I am using the code like this: Date questionDate = question.getStartDate(); Date today = new Date(); if(today.equals(questionDate)){ System.out.println(\"Both are equals\"); } This is not working. The content of the variables is the following: questionDate contains 2010-06-30 00:31:40.0 today contains Wed Jun 30 01:41:25 IST 2010 How can I resolve this? 回答1: Date equality depends on the two dates being equal to the millisecond. Creating a new Date object

How do I check for null values in JavaScript?

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How can I check for null values in JavaScript? I wrote the code below but it didn't work. if (pass == null || cpass == null || email == null || cemail == null || user == null) { alert("fill all columns"); return false; } And how can I find errors in my JavaScript programs? Javascript is very flexible with regards to checking for "null" values. I'm guessing you're actually looking for empty strings, in which case this simpler code will work: if(!pass || !cpass || !email || !cemail || !user){ Which will check for empty strings ( "" ), null , undefined , false and the numbers 0 and NaN Please

Compare 2 images in php

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问题 Comparing 2 images to see if they are both the same files are easy, threw the files MD5, but is it possible or even plausible to determine if 2 images are same by using PHP GD to get the difference of the two images. If we where to get the difference of the two, and it was all white (id assume white or even black), then we would now know its both the same photo? Also side note: id like to know if its possible to get 2 images of equal size to create an onion skin effect, 50% transparency on 1

How can I compare two dates in PHP?

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问题 How can I compare two dates in PHP? In the database, the date looks like 2011-10-2. If I wanted to compare today\'s date against the date in the database to see which one is greater, how would I do it? I tried this, $today = date(\"Y-m-d\"); $expire = $row->expireDate //from db if($today < $expireDate) { //do something; } but it doesn\'t really work that way. What\'s another way of doing it? Update: I know this post is kinda old but i just wanted to mention carbon, which is a class thats used

Using jQuery to compare two arrays of Javascript objects

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问题 I have two arrays of JavaScript Objects that I\'d like to compare to see if they are the same. The objects may not (and most likely will not) be in the same order in each array. Each array shouldn\'t have any more than 10 objects. I thought jQuery might have an elegant solution to this problem, but I wasn\'t able to find much online. I know that a brute nested $.each(array, function(){}) solution could work, but is there any built in function that I\'m not aware of? Thanks. 回答1: There is an

What is best tool to compare two SQL Server databases (schema and data)? [duplicate]

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问题 Possible Duplicate: Free Tool to compare Sql Server tables I would like to compare two SQL Server databases including schema (table structure) and data in tables too. What is best tool to do this? 回答1: I am using Red-Gate's software: http://www.red-gate.com 回答2: I use schema and data comparison functionality built into the latest version Microsoft Visual Studio 2015 Community Edition (Free) or Professional / Premium / Ultimate edition. Works like a charm! http://channel9.msdn.com/Events

How would you compare two XML Documents?

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问题 As part of the base class for some extensive unit testing, I am writing a helper function which recursively compares the nodes of one XmlDocument object to another in C# (.NET). Some requirements of this: The first document is the source , e.g. what I want the XML document to look like. Thus the second is the one I want to find differences in and it must not contain extra nodes not in the first document. Must throw an exception when too many significant differences are found, and it should be

How to compare 2 files fast using .NET?

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问题 Typical approaches recommend reading the binary via FileStream and comparing it byte-by-byte. Would a checksum comparison such as CRC be faster? Are there any .NET libraries that can generate a checksum for a file? 回答1: A checksum comparison will most likely be slower than a byte-by-byte comparison. In order to generate a checksum, you'll need to load each byte of the file, and perform processing on it. You'll then have to do this on the second file. The processing will almost definitely be

How to compare two java objects [duplicate]

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问题 This question already has answers here : Compare two objects with .equals() and == operator (16 answers) Closed 6 years ago . I have two java objects that are instantiated from the same class. MyClass myClass1 = new MyClass(); MyClass myClass2 = new MyClass(); If I set both of their properties to the exact same values and then verify that they are the same if(myClass1 == myClass2){ // objects match ... } if(myClass1.equals(myClass2)){ // objects match ... } However, neither of these