Boolean values are one of the primitive data types supported by nyan. A boolean can only be one of two possible values: True or False.

decision : bool = True

Unit():
    convertible : bool

Spearman(Unit):
    convertible = True

Ram(Unit):
    convertible = False

The boolean value convertible of the object Spearman has the value True, while the boolean convertible of the object Ram has the value False.

Unit():
    convertible : bool = False

Archer(Unit):
    convertible = True

Overwrites the old value with a new one.

Ram():
    convertible = False

Conformity<Ram>():
    convertible &= True

If both the given and the original value are True, the resulting value will also be True, else the new value will be False.

Ram():
    convertible = False

Conformity<Ram>():
    convertible |= True

If at least one of the two values is True - i.e. the given value, the original value or both -, the resulting value will be True. Only if both values are False, the new value will also be False.