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Add distinct, distinct_by built-ins for sequence #113

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clyoudu wants to merge 1 commit into apache:2.3-gae from clyoudu:2.3-gae

clyoudu commented Aug 23, 2024 •

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Add distinct, distinct_by built-ins for sequence which sub variable rules same as sort/sort_by.

Why?

Data array with simple element type(string, number, boolean, date) often require deduplication，but there is no built-in for sequence deduplication. At present, it can only be achieved through cumbersome way such as the following:

<!-- sort first -->
<#assign checkImportList = checkImport?split("\n")?sort>
<!-- compare with prev item -->
<#list checkImportList as check>
    <#if check != "">
        <#if check?index <= 0 || check != checkImportList[check?index - 1]>
${check}
        </#if>
    </#if>
</#list>

and original order of elements discarded

Sometimes data array with hash type require deduplication too.


          Add distinct, distinct_by built-ins for sequence which sub variable r…

ac6b01f

…ules same as sort/sort_by.

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