References, by default, numify to their addresses. Those reference addresses are unique for every reference, so it can often be used in equality checks. However, in the snippet you showed, you’d first have to make sure that both $ref1 and $ref2 are actually references. Otherwise you might get incorrect results due to regular scalars containing … Read more
The queryset objects will not be identical if they are the result of different queries even if they have the same values in their result (compare ds1.query and ds2.query). If you convert the query set to a list first, you should be able to do a normal comparison (assuming they have the same sort order … Read more
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 lazy/mostly right way, which is comparing the length of the files; and the accurate but more involved way, which is comparing a hash … Read more
Try this: String(regexp1) === String(regexp2)) You are getting false because those two are different objects.
tl;dr Use the modern java.time classes instead of those troublesome legacy date-time classes. myPreparedStatement.setObject( … , Instant.now() // Capture the current moment in UTC. ) Old Date-Time Classes Poorly Designed Put more bluntly, the java.sql.Timestamp/.Date/.Time classes are a hack, a bad hack. Like java.util.Date/.Calendar, they are the result of poor design choices. The java.sql types … Read more
What you are looking for is called Delta-E. http://www.colorwiki.com/wiki/Delta_E:_The_Color_Difference It is the distance between two colors in LAB color space. It is said that the human eye cannot distinguish colors below 1 DeltaE (I find that my eyes can find differences in colors below 1 DeltaE, each person is different.) There are 4 formulas for … Read more
By far my favorite is to use the org.apache.commons.io.IOUtils helper class from the Apache Commons IO library: IOUtils.contentEquals( is1, is2 );
To substract two files in notepad++ (file1 – file2) you may follow this procedure: Recommended: If possible, remove duplicates on both files, specially if the files are big. To do this: Edit => Line operations => Sort Lines Lexicographically Ascending (do it on both files) Add —————————- as a footer on file1 (add at least … Read more
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 element with the lowest index i such that (o==null ? get(i)==null : … Read more
Your global.User is undefined, not null. When using == they evaluate to equal, but with === the items you are comparing need to be the same type. undefined has the type undefined and null has the type object. undefined and null are very similar, but they generally mean two very different things. Usually undefined is … Read more