difference between != and !==
1736
How do the PHP equality (== double equals) and identity (=== triple equals) comparison operators differ?
42368
Why does the exclamation mark `!` sometimes upset bash?
152780
what is the difference between null != object and object!=null
75416
what is the difference between >&2 and &>2
127005
' ... != null' or 'null != ....' best performance?
51833
What does `!!` mean in `sudo !!`?
665
Which equals operator (== vs ===) should be used in JavaScript comparisons?
103008
What does !$ mean?
57332
!! c operator, is a two NOT?
10298
Difference between == and === in JavaScript
145384
What's the difference between 'int?' and 'int' in C#?
57386
Why don't C++ compilers define operator== and operator!=?
63088
What does the '!!!' syntax mean in javascript?
3574
What is the !! (not not) operator in JavaScript?
139105
Difference between if () { } and if () : endif;
73203
String-bool comparsion - why?
17037
When are "if" and "whether" equivalent?