smalltalk(初学者)(Pharo)中的关键字消息 [英] Keyword messages in smalltalk (Beginner)(Pharo)

问题描述

我正在尝试创建关键字消息样式方法，但是我不知道如何从该方法内部访问Receiver.我敢肯定这很简单，但是我找不到任何答案.我试图实现的是多余的，但我仍然想知道它是如何工作的.

I am trying to create a keyword message style method, but I can't figure out how to access the Receiver from inside the method. I am sure this is simple, however I can't find the answer anywhere. What I am trying to implement is redundant, but I would still like to know how it works.

subst: i1 by: i2
      ^ self copyReplaceAll: i1 with: i2.

它将在工作空间中按以下方式调用:

It would be called in the workspace as follows:

string1 := 'Lemon'.
string2 := 'm'.
string3 := 'ss'.
string1 subst: string2 by: string3.

错误消息:"MessageNotUnderstood:ByteString >> subst:by:"

Error msg: "MessageNotUnderstood: ByteString>>subst:by:"

该方法应该做的就是用"ss"替换"Lemon"中"m"的每个出现，以创建"Lesson"(copyReplaceAll已经做到了).我不知道如何将string1放入该方法.任何帮助将不胜感激，

All the method should do is replace every occurance of "m" in "Lemon" with "ss" to create "Lesson" (which copyReplaceAll already does). I can't figure out how to get string1 into the method. Any help would be greatly appreciated,

提前谢谢！

推荐答案

self是当前对象(即接收者).

self is the current object (i.e. the receiver).

请阅读(或至少略读)教程以获取基础知识.

"MessageNotUnderstood: ByteString>>subst:by:"

此错误意味着您尚未在ByteString上定义消息.您可能没有在任何地方实际定义它，或者在错误的类上定义了它.

This error means that you have not defined the message on ByteString. Either you have failed to actually define it anywhere, or you have defined it on the wrong class.

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