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List/Set.count


Operator Type: 

Operator Scope of Action: 

Operator Purpose: 

Operator First Added: 

Operator Altered: 

 Property   [other Property type actions]

 List   [operators of similar scope]

 Data manipulation   [other Data manipulation operators]

 Baseline

 


List/set.count

The property .count counts the Number of discrete items in the specified List or Set data type attribute.

This is better used instead of Count(list) or List/Set.size.

The subject list is evaluated so can use a literal list or $attribute(note). It can also use more complex expressions to get data - as long as the result is an attribute of the List or Set data type.

For example if $KeyAttributes for the current note is "Color;Color2;NameFont" then the code

$KeyAttributes.count 

is effectively

("Color;Color2;NameFont").count 

and not surprisingly returns 3. Note that the count is not all unique values for the attribute across the whole TBX - scope is restricted to 'this' note or another nominated note. Specimen usage:

count($KeyAttributes) 

count($KeyAttributes(some other note)) 

To use .count with a list of items that are attributes or expressions, use list() to pre-create a list:

Works: $MyNum = list(4+2,9+6).count (output: 2)

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)).

Examples

The following is a trivial example (given you could use $ChildCount instead) but shows how count can be used in a more subtle way:

$MyNum = collect(children,$Name).count 

The result of collect is a List, in this case a number of note titles. List.count will return the number of values in the list (including duplicates). To get a de-duped count, chain the .unique function before the .count:

collect(children,$Name).unique.count