On Dec 24, 6:43 pm, Garrett Smith <dhtmlkitc...@gmail.com> wrote:
> The client of the API gets an interface object that has properties and
> methods so instanceof and constructor shouldn't matter.
instanceof is important for an interface consumer to be certain that
they are using the proper object:
function draw(group){
if(group instanceof Group){
group.method1();
group.method2();
group.method3();
} else {
throw new Error("Shape Group Expected");
}
}
vs
function draw2(group){
if(typeof group == "object" && typeof group.method1 == "function"
&& typeof group.method2 == "function"
&& typeof group.method3 == "function"){
//well, it looks like a group....
group.method1();
group.method2();
group.method3(); //oops, its not the droid you're looking for
} else {
throw new Error("Shape Group Expected");
}
}
--
To view archived discussions from the original JSMentors Mailman list:
http://www.mail-archive.com/jsmentors@jsmentors.com/
To search via a non-Google archive, visit here:
http://www.mail-archive.com/jsmentors@googlegroups.com/
To unsubscribe from this group, send email to
jsmentors+unsubscr...@googlegroups.com
