Can I define custom operator overloads in Javascript? [duplicate]

Question

Is it possible to define custom operators between instances of a type in JavaScript?

For example, given that I have a custom vector class, is it possible to use

vect1 == vect2 

to check for equality, whilst the underlying code would be something like this?

operator ==(a, b) {     return a.x == b.x && a.y == b.y && a.z == b.z; } 

(This is nonsense of course.)

Answer 1

I agree that the equal function on the vector prototype is the best solution. Note that you can also build other infix-like operators via chaining.

function Vector(x, y, z) {     this.x = x;     this.y = y;     this.z = z; }  Vector.prototype.add = function (v2) {     var v = new Vector(this.x + v2.x,                        this.y + v2.y,                        this.z + v2.z);     return v; }  Vector.prototype.equal = function (v2) {     return this.x == v2.x && this.y == v2.y && this.z == v2.z; } 

You can see online sample here.

Update: Here's a more extensive sample of creating a Factory function that supports chaining.