在Smalltalk中重构if-chains而没有类爆炸 [英] Refactoring if-chains in Smalltalk without class explosion

问题描述

由于Smalltalk不鼓励使用caseOf：，在没有类爆炸的情况下实现以下情况有哪些备选方案？

As Smalltalk discourages the use of caseOf:, what aternatives exists to implement the following situation without class explosion?

self condition1
        ifTrue: [ self actionForCondition1 ]
        ifFalse: [ 
            self condition2
                ifTrue: [ self actionForCondition2 ]
                ifFalse: [ 
                    self condition3
                        ifTrue: [ self actionForCondition3 ]
                        ifFalse: [ ....  ] ] ]

推荐答案

如果你滚动到接近结尾

http://www.desk.org:8080/CampSmalltalk/control%20flow

你会发现句子

在Smalltalk中有四种表达案例陈述的方法。

"There are four ways to express a case-statement in Smalltalk."

后跟链接示例。

文本在稍微长一系列页面的中间，偶尔提到假设导师和学生参加Smalltalk课程以便说明;为了你的问题，你可以忽略它）

The text is in the middle of a slightly longer series of pages and makes occasional references to hypothetical tutor and students ina Smalltalk course for purposes of illustration; you can ignore that for the purposes of your question)

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