Is Subtracting Zero some sort of JavaScript performance trick?

Question

Looking in the jQuery core I found the following code convention:

nth: function(elem, i, match){
    return match[3] - 0 === i;
},

And I wa

Answer 1

Your main reason to use this syntax is if you have generic code that may be any number (int or float) and you want to do a type-sensitive compare (===)