在foreach循环中使用if语句

Question

我似乎总是在同一代码块中使用2个“ end”的问题，例如：

 Worker = fun (File) ->
 {ok, Device} = file:read_file([File]),
 Li = string:tokens(erlang:binary_to_list(Device), "\n"),
 Check = string:join(Li, "\r\n"),
 FindStr = string:str(Check, "yellow"),
 if
  FindStr > 1 -> io:fwrite("found");
  true -> io:fwrite("not found")
 end,
end,

消息是“语法错误之前：'结束'”

Answer 1

您需要删除两端之间的逗号。

Worker = fun (File) ->
 {ok, Device} = file:read_file([File]),
 Li = string:tokens(erlang:binary_to_list(Device), "\n"),
 Check = string:join(Li, "\r\n"),
 FindStr = string:str(Check, "yellow"),
 if
  FindStr > 1 -> io:fwrite("found");
  true -> io:fwrite("not found")
 end
end,