Рекомендую так же изредка в хелп заглядывать, там это прекрасно описано:
| Цитата |
...
The definition of an array property can be followed by the default directive, in which case the array property becomes the default property of the class. For example:
| Код |
type
TStringArray = class
public
property Strings[Index: Integer]: string ...; default;
...
end;
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If a class has a default property, you can access that property with the abbreviation object[index], which is equivalent to object.property[index]. For example, given the declaration above, StringArray.Strings[7] can be abbreviated to StringArray[7].
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