From Action Script 2.0 to 3.0 compiling errors - actionscript-3

Question

From the errors above what should I change in the code? I'm new to AS3 and a point in the right direction will help a lot, thanks!
Scene 1, Layer 'Script Layer', Frame 18, Line 62, Column 19 1084: Syntax error: expecting rightparen before add.
Scene 1, Layer 'Script Layer', Frame 18, Line 62, Column 29 1084: Syntax error: expecting rightparen before eq.
Scene 1, Layer 'Script Layer', Frame 18, Line 68, Column 24 1084: Syntax error: expecting rightparen before add.
Scene 1, Layer 'Script Layer', Frame 18, Line 68, Column 48 1084: Syntax error: expecting rightbrace before rightparen.
leng = 52;
q = 0;
while(Number(q) < Number(leng))
{
rand = random(52);
if(eval("c" add rand) eq "empty")
{
q = q - 1;
}
else
{
set("shuffle" add q,eval("c" add rand));
set("c" add rand,"empty");
}
q = Number(q) + 1;
}
q = 0;
}
ShufflePloy();

Answer 1

I don't know much about AS2, but first I'd try changing rand = random(52); to:
rand = Math.floor(Math.random()*52);
and then if(eval("c" add rand) eq "empty")
to
if(this["c"+rand] == "empty")
and the contents of the else block to
this["shuffle"+q] = this["c"+rand];
this["c"+rand] = "empty";