Conventions

• All the functions have the same calling sequence (arguments). Every method must have the specified calling sequence, even though it may not use some of the arguments.

• It is conventional to hyphenate the class name and selector to make the name of the method; but not all of our method names follow this pattern.

• In the send syntax, the object to which the message is sent is always the first argument, and the selector (abstract function name) is the second argument. The selector is quoted in our implementation of message sending. Any other arguments follow the selector.

• The selector is not used as an argument of the method.

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