Pyli/Methods/Logical

Logical Methods

• (ident val): Returns val, unmodified. Opposite of not.
• (not val): True if False, False otherwise.
• (and a b ...): True if all of a, b, etc... are True. Employs short-circuiting and returns the last value.
• (or a b ...): True if any of a, b, etc... are True. Employs short-circuiting and returns the first true value.
• (nand a b ...): True if all of a, b, etc... are False. Employs short-circuiting but only returns True or False.
  • (nand a b c d) => (and (not a) (not b) (not c) (not d))
• (nor a b ...): True if any of a, b, etc... are False. Employs short-circuiting but only returns True or False.
  • (nor a b c d) => (or (not a) (not b) (not c) (not d))
• (xor a b) => True if a is True and b is False, or vice-versa. Returns the true value.
  • (xor False False) => False
  • (xor False 5) => 5
  • (xor 7 False) => 7
  • (xor 7 5) => False