ListEach

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上次更新日期： 2022年1月20日 | 也应用至 ColdFusion

ColdFusion

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Description

Iterates over every element of a List object and can call a UDF function, passed as the second argument.

Returns

None

History

ColdFusion (2018 Release): Made the following changes:

Parameter str is renamed to list
Parameter function is renamed to closure
Parameter delim is renamed to delimiters

Syntax

ListEach(String list, UDFMethod closure [, String delimiters, boolean includeEmptyFields])

Parameters

Parameter	Description
list	An input list object.
closure	UDF or closure object.
delimiters	A list delimiter to be used. The default value is comma (,).
includeEmptyFields	Boolean. Whether to allow empty fields. Default is false.

Also, the original array can also be passed to the closure function. So the following code is also valid:

...
function xclosure(empname, index, empArray)
{
 
}
...

Example 1

<cfscript>
    cityList = "San Jose,New York, Boston, Las Vegas";
    function printCity(String city)
    {
        WriteOutput("<br>Current city: " & city);
    }
    ListEach(cityList ,printCity);
</cfscript>

Output

Current city: San Jose
Current city: New York
Current city: Boston
Current city: Las Vegas

Example 2

<cfscript>
       myList="Tokyo,Bangkok,Jakarta,Manila,Bangalore,Shanghai";
       ListEach(myList,function(myListElement,index,myList){
             WriteOutput("#index#:#myListElement#" & " ");
             });
</cfscript>

Output

1:Tokyo 2:Bangkok 3:Jakarta 4:Manila 5:Bangalore 6:Shanghai