Let's assume I would like to implement a Person class with a name and firstName but also get a fullName.
Object subclass: #Person
slots: { #name. #firstName. #fullName => ComputedSlot with: [ :obj | obj firstName asString , ' ' , obj name asString ] }
classVariables: { }
package: 'Simple-Example'
so when you test
|p| p := Person new. p name: 'Adams'. p firstName: 'Douglas'. p fullName
it would return the full name 'Douglas Adams'.
When you now add an additional class side method #firstName:name: like
firstName: firstName lastName: lastName ^(self new) firstName: firstName; name: lastName; yourself
you can simply write with our small english like DSL:
(Person firstName: 'Douglas' lastName: 'Adams') fullName
to get the same result.
For sure we could have implement the getter method #fullName like this:
fullName ^self firstName asString , ' ' , self name asString
to achieve the same - but a computed slot shows up really in the inspector as if it would be a real variable and is recomputed if you for instance would change the name or firstName.
