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What is the equivalent to the C# "!" operator in F#?
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The ! (logical negation) operator determines whether the operand evaluates to 0 (false) or nonzero (true). The expression yields the value 1 (true) if the operand evaluates to 0, and yields the value 0 (false) if the operand evaluates to a nonzero value.
In logic, negation, also called the logical complement, is an operation that takes a proposition to another proposition "not ", written , or . It is interpreted intuitively as being true when is false, and false when is true. Negation is thus a unary logical connective.
The not operator is a logical operator, represented in Java by the ! symbol. It's a unary operator that takes a boolean value as its operand. The not operator works by inverting (or negating) the value of its operand.
Negation: The not operator in Python can be used only in the unary form, which means negation, returning the a result that is the opposite of its operand. Its boolean prototype is not (bool) -> bool.
According to "Foundations of F#", page 61:
F# uses a function called
notfor Boolean "not" operations.
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