List 汇总列表中的动态字段

我有这样一个清单：

<cfset list ="group 1:1; group 2:4; group a:7; group 1:3; group a:1;">

---

所以这个列表只是一个例子，事实上，它更大，有更多的组（动态名称）。我用的是Coldfusion/Lucee。有人能帮我吗？

这只是众多可能的替代方法之一。从使用查询而不是列表作为起始值开始

我所做的是用

循环列表作为分隔符，并将值添加到结构中。我稍后使用该结构循环并列出最终的总数

<cfset list ="group 1:1; group 2:4; group a:7; group 1:3; group a:1;">
<cfset totalStruct = {}>
<cfloop list="#list#" item="group" delimiters=';'>
  <cfset groupName = listFirst(group, ':')>
  <cfset groupNameKey = replace(groupName, ' ', '', 'all')>
  <cfset groupValue = val(listLast(group, ':'))>
  <cfif !structKeyExists(totalStruct, groupNameKey)>
    <cfset totalStruct[groupNameKey] = {name:groupName, total=groupValue}>
  <cfelse>
    <cfset totalStruct[groupNameKey].total += groupValue>
  </cfif>
</cfloop>
<cfoutput>
  <ul>
    <cfloop collection="#totalStruct#" item="group">
      <li>#totalStruct[group].name# : #totalStruct[group].total#</li>
    </cfloop>
  </ul>
</cfoutput>



#totalStruct[group]。名称：#totalStruct[group]。总计#


另一种选择是使用
map
和/或
reduce
闭包函数来解析列表

注1：我通常发现cfscript对于解析文本或“循环”的大多数事情来说都要容易得多

注2：我不太喜欢循环，尤其是大文本值的循环。闭包函数的性能可能会更好

然后使用
reduce（）
，而不在函数内部

<cfscript>
    //// https://docs.lucee.org/reference/functions/listreduce.html
    r = listReduce(lst,
        function(prev,nxt){
            k = nxt.listFirst(":").ltrim() ;  /// Get the "key" and strip extra leading space.
            /// To shorten it, I just skipped setting the value beforehand and just did it while setting the struct value. Same method as above.
            prev["#k#"] = (nxt.listLast(":"))+(prev["#k#"]?:0) ; 
            return prev ;
        }
        ,
        {}    // Initial value
        ,";"  // Delimiter
    ) ;
    

    writedump(r) ;
</cfscript>

<cfset lst ="group 1:1; group 2:4; group a:7; group 1:3; group a:1;">

<cfscript>
    public Struct function parseLst (required String lst) {
        var retval = {} ; //// Default return variable. 
        //// https://docs.lucee.org/reference/functions/listmap.html
        arguments.lst.listmap(    
            function(el) {
                var k = el.listFirst(":").ltrim() ; /// Get the "key" and strip extra leading space.
                var v = el.listLast(":") ; /// Get the "value".
                
                var p = retval["#k#"]?:0 ; /// Use Elvis to default to 0 if no struct Key exists. 
                
                retval["#k#"] = v + p ; /// Set the value of the key. NOTE: A struck key with the same name will generally overwrite itself. We want to add it.
            }
            ,";" /// Specify the delimiter of the list. 
        ) ;
        
        return retval ;
    }

    writeDump(parseLst(lst));
</cfscript>

<cfscript>
    //// https://docs.lucee.org/reference/functions/listreduce.html
    r = listReduce(lst,
        function(prev,nxt){
            k = nxt.listFirst(":").ltrim() ;  /// Get the "key" and strip extra leading space.
            /// To shorten it, I just skipped setting the value beforehand and just did it while setting the struct value. Same method as above.
            prev["#k#"] = (nxt.listLast(":"))+(prev["#k#"]?:0) ; 
            return prev ;
        }
        ,
        {}    // Initial value
        ,";"  // Delimiter
    ) ;
    

    writedump(r) ;
</cfscript>

<cfscript>
    //// https://docs.lucee.org/reference/functions/listreduce.html
    s = listReduce(lst,
        function(prev,nxt){
            var elem = nxt.listToArray(":") ;
            
            prev["#elem[1].ltrim()#"] = elem[2] + (prev["#elem[1].ltrim()#"]?:0) ;
            return prev ;
        }
        ,
        {}    // Initial value
        ,";"  // Delimiter
    ) ;
    

    writedump(s) ;
</cfscript>