Function booleanParameter

Creates a new parameter expression. The difference with boolean is that you can change the value of a parameter later on, and the styling will be updated to reflect the new value without having to re-create the expressions in which it is used. Only booleans may be used as value.

  var parameter = ExpressionFactory.booleanParameter(true);
  ...
  parameter.value = false;//Only ever assign booleans.
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