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Contents
# frozen_string_literal: true
module ConvenientService
module Examples
module Standard
module V1
class Factorial
module Services
class Calculate
include ConvenientService::Standard::V1::Config
attr_reader :number, :timeout_seconds
def initialize(number:, timeout_seconds: 10)
@number = number
@timeout_seconds = timeout_seconds
end
def result
return failure(number: "is `nil`") if number.nil?
return failure(number: "is NOT an integer") unless number.instance_of?(::Integer)
return failure(number: "is lower than `0`") if number < 0
return error("Timeout (`#{timeout_seconds}` seconds) is exceeded for `#{number}`") if factorial.timeout?
success(factorial: factorial.value)
end
private
def factorial
@factorial ||= Utils::Timeout.with_timeout(timeout_seconds) { calculate_factorial }
end
##
# @internal
# NOTE: What is a Factorial?
# - https://en.wikipedia.org/wiki/Factorial
#
def calculate_factorial
return 1 if [0, 1].include?(number)
1.upto(number).reduce(1) { |prev_value, next_value| prev_value * next_value }
end
end
end
end
end
end
end
end
Version data entries
4 entries across 4 versions & 1 rubygems