Methods
- After slot list, series of expressions, separated by periods.
- Arguments indicated with argument slots:
- (| :x. :y | x squared + y squared)
- Shorthand for method arguments:
- add: el = (addLast: el)
- add: = (| :el | addLast: el)
- + = (| :pt | ((x + pt x) @ (y + pt y))
- + pt = ((x + pt x) @ (y + pt y))
|
Methods
After a method's slot list (which is optional) comes the body of the method.
This is a sequence of expressions, separated by periods.
The value returned by the method is the value of the last expression.
Each expression will usually be a message send (as there is no point in merely
mentioning a literal, except as the last expression).
Arguments to methods
Some methods require arguments. The formal arguments are indicated with
argument slots:
(| :x. :y | x squared + y squared )
This defines a method object which accepts two arguments, accessible as x and y in
the method.
When defining a method slot, a short form is provided. These are equivalent:
add: = (| :el | addLast: el)
add: el = (addLast: el)
+ = (| :pt | ((x + pt x) @ (y + pt y))
+ pt = ((x + pt x) @ (y + pt y))
The long form is rarely used in practice.
|
