CODEWITHSUNDEEP
smalltalk
Yuval Levy
Yuval Levy

Reputation: 2516

smalltalk method call with parameters

I wrote the following method in smalltalk:

initializeWithStart: startWith step: theStep count: theCount

self initialize.
startNumber := startWith.
stepSize := theStep.
countUntil := theCount.

and i just want to call this method after creating an object from the workspace. so I wrote:

mySq := ArithmeticsS new.
mySq initializeWithStart: '2' step:'4' count:'10'.

why do I get error "MessageNotUnderstood:undefinedobject>>initializeWithStart:step:count:"?

Upvotes: 1

Views: 1389

Answers (2)

prgDevelop
prgDevelop

Reputation: 1587

You should instantiate like this:

mySq := ArithmeticsS new initializeWithStart: 2 step:4 count:10.

Upvotes: 0

dcorking
dcorking

Reputation: 1206

We can't say for sure without more context, but it looks like you created the new method on the class side, instead of the instance side.

In the workspace, you chose to send the message to an instance.

To find out, evaluate (print)

ArithmeticsS respondsTo: #initializeWithStart:step:count:

If the method is on the class side, that will be true. Delete that method and save it on the instance side instead.

Now evaluate

ArithmeticsS new respondsTo: #initializeWithStart:step:count:

With new, this checks for your method on the instance side. It should be true. My guess from the information you posted is that it is false, which means that you didn't save the method in the right place.

Check the documentation for your dialect of Smalltalk to confirm how to save an instance method.

Upvotes: 1

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