Elixir使用模式匹配获取列表的总和
示例
defmodule Math do
# We start of by passing the sum/1 function a list of numbers.
def sum(numbers) do
do_sum(numbers, 0)
end
# Recurse over the list when it contains at least one element.
# We break the list up into two parts:
# head: the first element of the list
# tail: a list of all elements except the head
# Every time this function is executed it makes the list of numbers
# one element smaller until it is empty.
defp do_sum([head|tail], acc) do
do_sum(tail, head + acc)
end
# When we have reached the end of the list, return the accumulated sum
defp do_sum([], acc), do: acc
end
热门推荐
10 毕业写给学校简短祝福语
11 日语贺卡日常祝福语简短
12 新年祝福语大全牛年 简短
13 军校博士毕业祝福语简短
14 经典生日祝福语范文简短
15 过年祝自己祝福语简短
16 过年给美女祝福语简短
17 美术分班祝福语简短精辟
18 狗年祝福语简短的英语