···## assumes 5 possible vote categories, but easily adaptable

DEFAULT_PRIOR = [2, 2, 2, 2, 2]

input is a five-element array of integers

output is a score between 1.0 and 5.0

def score votes, prior=DEFAULT_PRIOR posterior = votes.zip(prior).map { |a, b| a + b } sum = posterior.inject { |a, b| a + b } posterior. map.with_index { |v, i| (i + 1) * v }. inject { |a, b| a + b }. to_f / sum end···

求这段代码什么意思，不是搞 ruby，被限制发帖的路过。