max(list)

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max(list)

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

Both the operators max() and 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=max("1;100;2"); 

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

$Name=max("1;100;2"); 

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

If you do not have a set, create one on the fly using list(), collect() or collect_if():

$MyMax = max(list($DateA,$DateB,$DateC)); 

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

$MyMax = max(collect_if(all,$MyNum>0,$MyNum)); 

This allows export via ^value^:

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

When using Date-type data bear in mind that the unset Date default is "never" and that "never' is always before (i.e. less than) any set date. So to use max() with dates, filter out the unset values:

$MyMax = max(collect_if(descendants,($Modified!="never"),$Modified)); 

To use max() with a list of expressions, use list():

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