独钓寒江雪

elixir 之 cond 判断

说明

都不支持多 else

匹配条件可以用函数

用法

cond

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info1 = ""
info2 = ""

cond do
  String.length(info1) !== 0 ->
    "info1 not 0"

  String.length(info2) !== 0 ->
    "info2 not 0"

  String.length(info1) === 0 && String.length(info2) === 0 ->
    "len are 0"

  true ->
    "default"
end

if

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if String.valid?("aaa") && String.valid?("bbb") do
  "Valid string!"
else
  "Invalid string."
end
elixir