Because it is really different symbols even they look the same, first is the actual letter and has char code = 956 (0x3BC) and the second is the micro sign and has 181 (0xB5). References: Unicode Character ‘GREEK SMALL LETTER MU’ (U+03BC) Unicode Character ‘MICRO SIGN’ (U+00B5) So if you want to compare them and … Read more
Python (like Java, C, C++, .NET) uses string pooling / interning. The interpreter realises that “hello” is the same as “hello”, so it optimizes and uses the same location in memory. Another goodie: “hell” + “o” is “hello” ==> True
Use strcmp() to compare the contents of strings: if (strcmp(var1, “dev”) == 0) { } Explanation: in C, a string is a pointer to a memory location which contains bytes. Comparing a char* to a char* using the equality operator won’t work as expected, because you are comparing the memory locations of the strings rather … Read more
You could use the Levenshtein Distance algorithm. “The Levenshtein distance between two strings is defined as the minimum number of edits needed to transform one string into the other, with the allowable edit operations being insertion, deletion, or substitution of a single character.” – Wikipedia.com This one is from dotnetperls.com: using System; /// <summary> /// … Read more
Binary collation compares your string exactly as strcmp() in C would do, if characters are different (be it just case or diacritics difference). The downside of it that the sort order is not natural. An example of unnatural sort order (as in “binary” is) : A,B,a,b Natural sort order would be in this case e.g … Read more
Great question. I’m an engineer at SeatGeek, so I think I can help here. We have a great blog post that explains the differences quite well, but I can summarize and offer some insight into how we use the different types. Overview Under the hood each of the four methods calculate the edit distance between … Read more
See perldoc perlop. Use lt, gt, eq, ne, and cmp as appropriate for string comparisons: Binary eq returns true if the left argument is stringwise equal to the right argument. Binary ne returns true if the left argument is stringwise not equal to the right argument. Binary cmp returns -1, 0, or 1 depending on … Read more
Leading from answers from @Bozho and @aioobe, lexicographic comparisons are similar to the ordering that one might find in a dictionary. The Java String class provides the .compareTo () method in order to lexicographically compare Strings. It is used like this “apple”.compareTo (“banana”). The return of this method is an int which can be interpreted … Read more
You should almost always use equals. You can be certain that string1 == string2 will work if: You’ve already made sure you’ve got distinct values in some other way (e.g. you’re using string values fetched from a set, but comparing them for some other reason) You know you’re dealing with compile-time string constants You’ve manually … Read more
There is no function that does this in the C standard. Unix systems that comply with POSIX are required to have strcasecmp in the header strings.h; Microsoft systems have stricmp. To be on the portable side, write your own: int strcicmp(char const *a, char const *b) { for (;; a++, b++) { int d = … Read more