equality

x and y are two variables. I can check if they're equal using x == y , but how can I check if they have the same identity? Example: x = [1, 2, 3] y = [1, 2, 3] Now x == y is True because x and y are equal, however, x and y aren't the same object. I'm looking for something like sameObject(x, y) which in that case is supposed to be False. You can use is to check if two objects have the same identity. >>> x = [1, 2, 3] >>> y = [1, 2, 3] >>> x == y True >>> x is y False To build on the answer from Mark Byers: The is evaluation to distinguish identities will work when the variables contain objects

Any idea why I get "Maya is not Maya" as a result of this code? if ("Maya" == "Maya") printf("Maya is Maya \n"); else printf("Maya is not Maya \n"); Georg Fritzsche Because you are actually comparing two pointers - use e.g. one of the following instead: if (std::string("Maya") == "Maya") { /* ... */ } if (std::strcmp("Maya", "Maya") == 0) { /* ... */ } This is because C++03, §2.13.4 says: An ordinary string literal has type “array of n const char ” ... and in your case a conversion to pointer applies. See also this question on why you can't provide an overload for == for this case. You are not

This question already has an answer here: Which equals operator (== vs ===) should be used in JavaScript comparisons? 49 answers JavaScript comparison operators: Identity vs. Equality 4 answers Why does the following statement return false in JavaScript? new String('hello') === new String('hello') Pointy Two String objects will always be unequal to each other. Note that JavaScript has string primitive values as well as a String constructor to create wrapper objects. All object equality comparisons (especially with === ) are carried out as a test for reference equality . References to two

I read in the documentation for the String class that eql? is a strict equality operator, without type conversion, and == is a equality operator which tries to convert second its argument to a String, and, the C source code for this methods confirms that: The eql? source code: static VALUE rb_str_eql(VALUE str1, VALUE str2) { if (str1 == str2) return Qtrue; if (TYPE(str2) != T_STRING) return Qfalse; return str_eql(str1, str2); } The == source code: VALUE rb_str_equal(VALUE str1, VALUE str2) { if (str1 == str2) return Qtrue; if (TYPE(str2) != T_STRING) { if (!rb_respond_to(str2, rb_intern("to