TryCF Gist

trycf-gist.cfm

<cfscript>

data = [
    { 
        dollarsafter : 5.4
        , dollarsbefore : 8.1
        , expenselineitemid : 602684
        , expensereportid : 129591
    }
    ,{ 
        dollarsafter : 5.4
        , dollarsbefore : 8.1
        , expenselineitemid : 602684
        , expensereportid : 129593
    }
    ,{ 
        dollarsafter : 5.4
        , dollarsbefore : 8.1
        , expenselineitemid : 602684
        , expensereportid : 129591
    }
];

function doFilter( required array data, required string key, index = {} ){
    return data.filter( function( item ){
        if( ! index.keyExists( item[ key ] ) ){
            index[ item[ key ] ] = '';
            return true;
        }
        return false;
    });
}

writeDump( doFilter( data, 'expensereportid' ) );
</cfscript>