Because you are using the == (similarity) operator and PHP is coercing the string to an int. To resolve it use the === (equality) operator, which checks not only if the value is the same, but also if the data type is the same, so “123” string and 123 int won’t be considered equal.
From Common Lisp: Equality Predicates (eq x y) is true if and only if x and y are the same identical object. The eql predicate is true if its arguments are eq, or if they are numbers of the same type with the same value, or if they are character objects that represent the same … Read more
Chris Lattner wrote on the developer forums: This is a feature we intentionally do not want to support. There are a variety of things that will cause pointer equality of functions (in the swift type system sense, which includes several kinds of closures) to fail or change depending on optimization. If “===” were defined on … Read more
The source of your confusion appears to be that there is a typo in the extract from C# station, which should read: “… except that the Equals works only on object instances. The ReferenceEquals method is static.” You are loosely correct about the differences in the semantic meanings of each (although “different instances of the … Read more
is checks that 2 arguments refer to the same object, == checks that 2 arguments have the same value. dir() returns a list which contains the same data for both foo and 10, but the actual list instances for the 2 things are different.
You use == or === : var thesame = obj1===obj2; From the MDN : If both operands are objects, then JavaScript compares internal references which are equal when operands refer to the same object in memory.
Well I think I found something that works: if (e1.valueOf() === e2.valueOf()) { console.log(“equal”) } But I’m a bit surprised that this isn’t mentioned anywhere in the documentation.
“foo” is a string primitive. (this concept does not exist in C# or Java) new String(“foo”) is boxed string object. The === operator behaves differently on primitives and objects. When comparing primitives (of the same type), === will return true if they both have the same value. When comparing objects, === will return true only … Read more
I’ll answer this question incrementally. Let’s start with the = equivalence predicate. The = predicate is used to check whether two numbers are equal. If you supply it anything else but a number then it will raise an error: (= 2 3) => #f (= 2.5 2.5) => #t (= ‘() ‘()) => error The … Read more
== works a = dict(one=1, two=2, three=3) b = {‘one’: 1, ‘two’: 2, ‘three’: 3} c = dict(zip([‘one’, ‘two’, ‘three’], [1, 2, 3])) d = dict([(‘two’, 2), (‘one’, 1), (‘three’, 3)]) e = dict({‘three’: 3, ‘one’: 1, ‘two’: 2}) a == b == c == d == e True I hope the above example helps … Read more