List/Set.max()

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List/Set.max()

List/Set.max

The List/Set.max() operator returns the largest item in a List or Set data type attribute.

This is a replacement for/alternative to the max() operator.

Both the operators List/Set.max and List.Set.min use lexical comparison in most cases, but numeric comparison if the context is numeric (i.e. the reference is a Number-type attribute) and/or all list items are numbers. Thus:

$Width=("1;100;2").max; 

Since "Width" is numeric, max() will be return 100.

$Name=("1;100;2").max; 

Since the attribute "Name" is a string, max() will return 2.

If without a list, create one on the fly:

$MyMax = collect(all,$MyNumber).max; 

$MyMax = collect(descendants,$Modified).max; 

This allows export via ^value^:

^value(collect(descendants,$Modified).max)^ 

To use max() with a list of items that are attributes or expressions, use list():

Works: $MyNumber = list(4+2,9+6).max; (output: 15)

For more complex examples, where list items are action code expressions, it may be necessary to use eval() to wrap each list item expression e.g. list(eval(expressionA),eval(expressionB)).

Using lists of dates

When using Date-type data bear in mind that the defaults for an unset Date attribute is "never" and that "never" is treated as sorting always before (i.e. less than) any set date. So to use .min with dates, filter out the unset values, whereas with .max it is not needed:

$MyMax = collect_if(descendants,$Modified).max; 

$MyMin = collect_if(descendants,($Modified!="never"),$Modified).min;