if (var) vs. if (var != "")
703
What is the best way to test for an empty string with jquery-out-of-the-box?
137088
if/else vs ternary operator
92055
In JavaScript, why is "0" equal to false, but when tested by 'if' it is not false by itself?
111657
Difference between "if x" and "if x is not None"
102641
ObjectiveC: if (obj) {...} AND if (obj != nil) {...}, which is better?
17037
When are "if" and "whether" equivalent?
134742
String comparison in Python: is vs. ==
72519
What's the difference between "==" and "=~"?
22122
How do you use the ? : (conditional) operator in JavaScript?
32293
What's the difference between if(!$variable) and if(isset($variable))?
10259
Javascript: What's more efficient, IF block or TRY/CATCH?
10298
Difference between == and === in JavaScript
23756
Why does one often see "null != variable" instead of "variable != null" in C#?
139105
Difference between if () { } and if () : endif;
147409
String.equals versus ==
32886
What is the difference between != and =! in Java?
63854
How do boolean operators work in 'if' conditions?