scaleExpression

An arcade expression object with an expression for scaling symbols in a dictionary renderer. The ArcadeExpression is evaluated at rendering time. If the expression is not valid or results in an invalid value, symbols will not be scaled and will display at their original size. For example, to scale symbols based on an attribute value, you can set ArcadeExpression.expression as follows. This expression if($feature.Symbol_Set == 40, 2.5, 1) scales the symbol size 2.5 times when symbol_set is 40.