[Newbies] Newbie: Error Checking in Dynamically typed Language
stephane.ducasse at free.fr
Sun Dec 10 08:46:16 UTC 2006
normally you will not do explicit check.
We only test when this is really important.
> Hi all,
> This is my first time working with a dynamically typed environment
> and my first instinct is to error check all arguments.
No good instinct for dynamically typed :)
> For example suppose I want to create an object to represent an
> octet in an IP address (a number between 0 and 256) I would do
> something like this:
> Object subclass: #Octet
> instanceVariables: 'octetValue'
> super initialize.
> octetValue := 0.
> setOctetValue: numBtw0And256
> octetValue = numBtw0And256 <-------Here's where I have a
> How do I know the numBtw0And256 is actually an integer between 0
> and 256 and not 'cat' or '3.14'?
> Since I came from statically typed languages I feel like I writing
> a whole bunch of error checking code along the lines of
> ifIsInteger: ... etc which doesn't seem to be in the spirit of Squeak.
> What am I doing wrong?
Just write your code and tests!
Initialize well your state.
Do only check if you absolutely want in your constructor?
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