119: Mainline

Parameters are names that serve as handles for objects that are supplied as message arguments, such as 4 in the expression 194 convertToCaloriesWith: 4.

Accordingly, whenever a convertToCaloriesWith: message appears, Smalltalk must arrange for the following to be done:

• Identify the argument object, 4, with a parameter—say caloriesPerGram—specified by you when you define the convertToCaloriesWith: method.
• Evaluate the expression self * caloriesPerGram.
• Answer the value of self * caloriesPerGram for use in other computations.