Why write `!!x`, when `x` will do?
47979
Double Negation in C++
107154
History of notation: "!"
68011
(![]+[])[+[]]... Explain why this works
27742
What does "${-#*i}" != "$-" mean?
38716
Is there a difference between “?!” and “!?”?
71607
What's this =! operator?
127109
What does #x inside a C macro mean?
41182
What does the construct x = x || y mean?
42605
Is there a technical reason to use > (<) instead of != when incrementing by 1 in a 'for' loop?
104032
Strange JavaScript idiom - what does "/xyz/.test(function(){xyz;})" do?
124298
What is the right way to use the `\!` spacing command?
42395
When to use the double not (!!) operator in JavaScript
143719
How does !! work in bash?
18190
Is there any point of using "return !0" in javascript?
58423
What does !! (double exclamation point) mean?
57386
Why don't C++ compilers define operator== and operator!=?
101523
Why is using `<<-` frowned upon and how can I avoid it?