首页 \ 问答 \ 根据列表元素创建过滤条件(Creating filter conditions based on list elements)

根据列表元素创建过滤条件(Creating filter conditions based on list elements)

我有兴趣创建一个过滤器,其条件取决于输入列表。 具体来说,我想定义过滤器,以便检查数字是否可以被输入列表中的任何数字整除。 因此对于单个元素将是:

my_filter a = filter (\x -> x `mod` a == 0)

基本上我想扩展这个,如果我有一个输入列表,它将执行以下操作:

my_filter [a,b] = filter (\x -> x `mod` a == 0 || x `mod` b == 0)

如何递归定义此过滤器,以便列表的每个元素创建一个新条件?


I'm interested in creating a filter, whose conditions depend on an input list. Specifically, I want to define the filter such that it checks whether a number is divisible by any number in my input list. So for a single element that would be:

my_filter a = filter (\x -> x `mod` a == 0)

basically I want to extend this such that if I have an input list, it would do the following:

my_filter [a,b] = filter (\x -> x `mod` a == 0 || x `mod` b == 0)

How can I define this filter recursively, such that each element of the list creates a new condition?


原文:https://stackoverflow.com/questions/41595863
更新时间:2022-01-03 12:01

最满意答案

循环遍历您的集合,当添加6行添加新列时,您可以使用嵌套表,但首选div。

<c:forEach varStatus="count" var="fruit" items="${fruits}">
...
  <c:when test=${count.index % 6 == 0}> //when loop count is multiple of six
  ... // create your column structure, be it, td, table or div
  </c:when>
</c:forEach>

Loop over your collection, when 6 rows added add a new column, you could use nested tables, but div's are preferred.

<c:forEach varStatus="count" var="fruit" items="${fruits}">
...
  <c:when test=${count.index % 6 == 0}> //when loop count is multiple of six
  ... // create your column structure, be it, td, table or div
  </c:when>
</c:forEach>

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