Would you...?

Example 48

Adding new properties to objects, and checking for their presence.

For instance, if we want to give some objects a flavor:

"Would you...?"
The House is a room. The mouse is an animal in the House.
The player carries some green eggs and a ham.
A food is a kind of thing that is edible. Food has some text called flavor. The flavor of food is usually "Tolerable."

Things are, in general, not edible by default, so we have to make them edible specifically in order to allow them to be eaten by the player. Here we've defined food to be edible by default, and we have given it a standard piece of flavor text.

The ham and the green eggs are food. The flavor of the green eggs is "Delicious!"
After eating something:
   if the noun provides the property flavor, say "[the flavor of the noun][paragraph break]";
   otherwise say "It's [noun]-flavored."

Note that we use "if the noun provides a flavor…" to make sure that the property exists before attempting to use it. Otherwise, there is the risk that we will try to print a property that does not exist, resulting in errors in the game.

We will only get the "It's [noun]-flavored." response if we successfully eat something that is not a food and does not have flavor text. To test this feature, let's suppose something that isn't exactly food but can theoretically be chewed on:

The player carries some paper. The paper is edible.
Test me with "eat ham / eat green eggs / eat paper".
Test me with "eat ham / eat green eggs / eat paper".
You can see a mouse here.


>[1] eat ham

>[2] eat green eggs

>[3] eat paper
It's paper-flavored.