"""
Factor that produces the most most recently-known value of Column.
"""
from .factor import CustomFactor
from ..term import SingleInputMixin


class Latest(SingleInputMixin, CustomFactor):
    """
    Factor producing the most recently-known value of `inputs[0]` on each day.
    """
    window_length = 1

    def compute(self, today, assets, out, data):
        out[:] = data[-1]