Why use !! to coerce a variable to boolean for use in a conditional expression?
3574
What is the !! (not not) operator in JavaScript?
76808
Meaning of ! in Java syntax
101523
Why is using `<<-` frowned upon and how can I avoid it?
11651
What does curly brackets in the `var { ... } = ...` statements do?
47477
What is "!!" in C?
97291
if(!x) vs if(x==false) in ruby
131761
Boolean expressions in Java
39485
Why does ('0' ? 'a' : 'b') behave different than ('0' == true ? 'a' : 'b')
46150
Can't use exclamation mark (!) in bash?
93559
use "if" rather than "whether" when the object clause is negative?
154567
difference between null != something and something != null
143770
Why does !! inside an alias not work?
123590
+ operator before expression in javascript: what does it do?
32886
What is the difference between != and =! in Java?
50416
What does the >?= operator mean?
103752
What is the difference between != NULL and IS NOT NULL in QGIS filter expressions?
77138
Why would you use an assignment in a condition?