Top "Boolean-expression" questions

A boolean expression is an expression in a programming language that produces a boolean value when evaluated, i.e. one of true or false.

Python `if x is not None` or `if not x is None`?

I've always thought of the if not x is None version to be more clear, but Google's style guide and …

python coding-style nonetype boolean-expression pep8
How to use OR condition in a JavaScript IF statement?

I understand that in JavaScript you can write: if (A && B) { do something } But how do I implement …

javascript boolean-expression
How to make "if not true condition"?

I would like to have the echo command executed when cat /etc/passwd | grep "sysa" is not true. What am …

bash if-statement syntax boolean-expression
Any good boolean expression simplifiers out there?

I was refactoring old code and encountered several IF conditions that were way too complex and long and I'm certain …

boolean-logic boolean-expression
Is this the proper way to do boolean test in SQL?

Assume active is a "boolean field" (tiny int, with 0 or 1) # Find all active users select * from users where active # Find …

sql boolean-expression
How can I express that two values are not equal to eachother?

Is there a method similar to equals() that expresses "not equal to"? An example of what I am trying to …

java if-statement equals boolean-expression
if (boolean == false) vs. if (!boolean)

Possible Duplicate: Is it bad to explicitly compare against boolean constants e.g. if (b == false) in Java? In this …

java boolean boolean-logic boolean-expression
'and' (boolean) vs '&' (bitwise) - Why difference in behavior with lists vs numpy arrays?

What explains the difference in behavior of boolean and bitwise operations on lists vs NumPy arrays? I'm confused about the …

python numpy bit-manipulation boolean-expression ampersand
Convert truthy or falsy to an explicit boolean

I have a variable. Let's call it toto. This toto can be set to undefined, null, a string, or an …

javascript boolean-expression
What's the difference between the dual and the complement of a boolean expression?

Its the same thing right? Or is there a slight difference? I just wanna make sure I'm not misunderstanding anything.

boolean boolean-logic boolean-expression boolean-operations