Embedding conditional statements

I've spent alot of time writing javascript lately, mainly handling events. (I know this is a CAD board but the principal is the same)

What I've realised is that i end up writing conditional statements with the same conditional statements for either result of the first

for example:

if( A == true){
 if(c==d){
     action(A+d)
 }
 else{
   action(A+c)
 }
}
else{
  if(c==d){
     action(A+d+1)
 }
 else{
   action(A+c+1)
 }
}

This is a relatively small example. My main reasoning is not creating unecessary local variable since js doesn't have manual garbage collection

What are the communities thoughts on the matter?

Ollie

Perhaps use an 'if-else' structure?

if ((c == d) && (A == true))
 action(A+d)
 else if (c == d)
 action(A+d+1)
 else if (A == true)
 action(A+c)
 else
 action(A+c+1)