Question

Which is best practice, which results in better performance?

using closure or dojo.lang.hitch ?

Thanks

Answer 1

Actually lang.hitch(scope, method) returns a closure, i.e. it returns a function, which will call function method in the given scope. That’s useful especially when defining callbacks in object oriented code, so you can write:

on(dom.byId("button"), "click", lang.hitch(this, "callback"));

instead of:

on(dom.byId("button"), "click", function(scope, method) {
    return function() {
        method.apply(scope);
    }
}(this, this["callback"])); // execute the anonymous function immediately to get a closure

Something like this will work:

on(dom.byId("button"), "click", this["callback"]);

but this inside the callback method will point to the button.

See the complete code with additional details in jsFiddle: http://jsfiddle.net/phusick/r7jLr/