gistfile1.as

import flash.utils.Dictionary;

var key;
var dict = new Dictionary();
dict['0'] = true;
dict['1'] = true;
dict['2'] = true;
dict['3'] = true;
dict['4'] = true;
var count:int = 3;
for (key in dict) {
	trace('key = ' + key);
	if (count-- == 0) {
		trace("hello");
		dict['0'] = "hello0";
		dict['1'] = "hello1";
		dict['2'] = "hello2";
		dict['3'] = "hello3";
	}
	delete dict[key];
}
trace('-----------')
for (key in dict) {
	trace('key = ' + key, dict[key]);
}

// key = 0
// key = 1
// key = 2
// key = 3
// hello
// key = 4
// -----------
// key = 0 hello0
// key = 1 hello1
// key = 2 hello2