Replacing nested if statements

Question

This is related to a chapter from beautiful code. And in that chapter I read about the nested ifs.

The author was talking about deeply nested if

Answer 1

You can just break once a part of the validation failed for example.

function validate(){
  if(b=="" || b==null){
      alert("Please enter your city");
      return false;
  }

  if(a=="" || a==null){
      alert("Please enter your address");
      return false;
  }
  return true;
}