检查wheter语句的条件是错误的(Condition that checks wheter statement is false)

 我有点挣扎这种语言。 我试图创造一个条件，只有当它是假的时才执行。 我有一个返回false的函数，但我不知道该怎么做。 见下面的代码： 
 
(define p (make-queue))
(enqueue! p 1)
(enqueue! p 1)
(enqueue! p 2)
(enqueue! p 3)
(memq 5 (queue->list p))
(cond
  [(false? (memq 4 (queue->list p))) "yaay"]
  )
 
 基本上我正在创建一个队列，然后我问memq，如果列表中有所需的值，在我的情况下返回false。 现在我需要执行“yaay”部分。 我怎样才能做到这一点？ 我试过要求假，我试过(= (#f) (memq 4 (queue->list p)))或一些简单的ifs，但这也不起作用 

I am kind of struggling with this language. I am trying to make a condition, that executes only, when it is false. I have a function that returns false, but I have no idea how to do it. See code below:
 
(define p (make-queue))
(enqueue! p 1)
(enqueue! p 1)
(enqueue! p 2)
(enqueue! p 3)
(memq 5 (queue->list p))
(cond
  [(false? (memq 4 (queue->list p))) "yaay"]
  )
 
Basically I am creating a queue, then I am asking with memq, if there is a desired value in the list, which in my case returns false. And now I need to execute the "yaay" part. How can I achieve that? I tried asking for false, I tried (= (#f) (memq 4 (queue->list p))) or some simple ifs, but that does not work either

原文：https://stackoverflow.com/questions/37774629