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Why "and" on an empty list returns true, does it imply that an empty list holds True? Sorry but I cannot read and comprehend this correctly, so please correct me. Thanks.
Prelude> and []
True
Prelude> or []
False
707
If the left side of the expression is "truthy", the expression will return the right side. That's it. So in false && false , the left side is "falsey", so the expression returns the left side, false .
true && true give true.
The true operator returns the bool value true to indicate that its operand is definitely true. The false operator returns the bool value true to indicate that its operand is definitely false. The true and false operators are not guaranteed to complement each other.
TRUE (say: not true) to evaluate to FALSE and ! FALSE (say: not false) to evaluate to TRUE. Try using the NOT operator and the equals operator to find the opposite of whether 5 is equal to 7.
and means: "Is everything there True?". When it's empty, everything's that is in there (which isn't much) is true, so that's a yes (True).
or means: "Is anything there True?". When there's nothing there, there's nothing true there. (False)
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