New functionalities

[znittzel]

Drop here new function proposals.

Here is one:

class constant:

    """
        Returns a function that no matter the arguments
        always returns self.value.
    """
    def __init__(self, value):
        self.value = value

    def __call__(self, *args, **kwargs):
        return self.value

This one is good for whenever you want a constant value but some other function requires a function as input. E.g.

maz.ifttt(
    lambda x: x > 0,
    lambda x: x+1,
    constant(0),

This differ from doing lambda: 0 since that one would require zero arguments and would crash in this case