Webmaster Forum / HTML, CSS, Scripts / JavaScript / April 2006

Try to guess what happens if I run the following code in any modern
browser. Don't cheat! Guess before you try it out.
Will I get:

1) 1,2...a,b
2) a,b...a,b
3) null...null
4) 1,2,a,b...1,2,a,b

Here is the code:

function Group() {
}

Group.prototype = {
 members: [],

 addMember: function(m) {
   this.members.push(m);
 },

 listMembers: function() {
   return this.members.join(",");
 }
};

var my1 = new Group();
my1.addMember(1);
my1.addMember(2);

var my2 = new Group();
my2.addMember("a");
my2.addMember("b");

alert(my1.listMembers() + "..." + my2.listMembers());

Cheers!
Nathar