Question

I want to define a JavaScript class, Foo.

Foo = function(value){     this.value = value; }; 

I will create ‘instances’ of my Foo:

foo1 = new Foo(1); foo2 = new Foo(1); 

and I want my instances of Foo to be comparable with each other using the standard == equality operator:

foo1 == foo2;      // this should be true 

I can not find a way to do this. I thought I was on to something with the valueOf() function, but this is only useful when one side of the comparison is a primitive, not as above where both are of type object.

Have I missed something really simple akin to Ruby’s

def ==(obj); end 

Answer 1

JavaScript does not have operator overloading. See this discussion covering your question.