list.SingleOrDefault()

Returns the single item in a single-element list, or null if the list is empty.

Syntax

any list.SingleOrDefault()

Returns

The value in the single-element list, or null if the list is empty.

Remarks

The method throws a SingleOrDefault called on a list with X elements error at runtime if the list has more than one elements.

Sample

listSample.rfs

var l = list.New();
trace "An empty list returns", l.SingleOrDefault();
l.Add("Frauenkleider");
trace i.SingleOrDefault();
l.Add("Büstenhalter");
/* 'SingleOrDefault called on a list with 2 elements' error at runtime
trace l.SingleOrDefault();
*/
<<null>>
"Frauenkleider"

Figure 402. The trace message output of the script above


Related links

list.Single()   The map data type
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