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count(list)


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 Function   [other Function type actions]

 List   [operators of similar scope]

 Mathematical   [other Mathematical operators]

 Baseline

 


count(list)

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

NOTE: It is recommended and generally easier to use List/Set.count (or alternatively List/Set.size).

count(listAttribute)

The listAttribute argument (List or Set) is evaluated so can use, $Attribute(note) or more complex expressions to get data - as long as the result is an list-based attribute (List or Set data types).

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

count($KeyAttributes) 

is effectively

count("Color;Color2;NameFont") 

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():

Works: $MyNum = count(list(4+2,9+6)) (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 we could use $ChildCount instead) but shows how count can be used in a more subtle way:

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

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

count(collect(children,$Name).unique)