See Expression Elements

Expression Value: Number of loops _numloops&

Expression Element: Built-in Properties

Expression Category: Geometry

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Number of loops

The number of loops used by a Polygon item.

Many polygon items have only one loop. However, any holes or islands will be stored as extra loops.

Expression Syntax: _numloops&

_numloops& returns the number of loops used by the Polygon item. For example a Polygon with two holes created by the Analysis tab > Boolean Operations > Symmetric Difference command would return 3.

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