总结和逆转

【问题标题】：Summary and reverse总结和逆转
【发布时间】：2021-02-07 02:47:15
【问题描述】：

我刚开始使用 FreeMarker，但没有得到答案。也许有人可以帮助我？

我想显示：<#assign test = ["x","y","z"] /> 使用 list 函数反向显示为 z,y,x，但我不知道该怎么做。如果我有：<#assign ordercount = ["20","40","60"]，如何使用 list 函数将所有数字的摘要作为结果？

【问题讨论】：

标签： reverse freemarker new-operator counting

【解决方案1】：

反向：

<#assign test = ["x","y","z"] >
${test?reverse?join(", ")}

结果：z、y、x

总结：

<#function sum nums...>
  <#local sum = 0>
  <#list nums as num>
    <#local sum += num>
  </#list>
  <#return sum>
</#function>
${sum(20, 40,60)}

结果：120

【讨论】：

【解决方案2】：

反向：

[#assign letters = ["x","y","z"]]
[#assign lettersReversed = []]

[#list letters as i]
    [#assign lettersReversed += [letters[letters?size-1-i?index]]]
[/#list]

字母反转：["z","y","x"]

总和：

[#assign numbers = ["20","40","60"]]

[#function sumStringNums input]
    [#local sum = 0]
    [#list input as i]
        [#local sum += i?number]
    [/#list]
    [#return sum]
[/#function]

${sumStringNums(numbers)}

输出：120

【讨论】：