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JavaScript if Else and question

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if I have 2 conditions A and B but I want to make and IF Else And, how is the syntax then.

If only A is filled then do...

If only B is filles then do...

If both A and B is filles then do...

How Will this syntax looks like ?






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If only A is filled, it means that B has to not be filled.

The structure would like similar to the following, assuming A and B are booleans:

if(A && !B) {
  // Only A
} else if(B && !A) {
  // Only B
} else if(A && B) {
  // Both A and B


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