Re: [Esug-list] destructDo:

Hello Christian,

the hint to Lisp is obvious. In Clojure (a modern Lisp-Dialect) destructuring (https://clojure.org/guides/destructuring) is used a lot.

Johannes

Am 28.03.2020 um 15:23 schrieb Christian Haider <[hidden email]>:

I chose the name because of the old Lisp “destructuring-bind”. But this is more powerful, because it does tree matching. This is just shallow.

I am not sure where the concept was invented first. It may have been Lisp.

 

 

Von: Norbert Hartl <[hidden email]> 
Gesendet: Samstag, 28. März 2020 14:20
An: Mark Plas <[hidden email]>
Cc: Christian Haider <[hidden email]>; [hidden email]; [hidden email]; [hidden email]
Betreff: Re: [Esug-list] destructDo:

 

I think the name destructDo: comes from destructuring assignment. 

 

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment

 

Norbert

Am 28.03.2020 um 14:15 schrieb Mark Plas <[hidden email]>:

 

Hello Christian,

 

" I don’t really like the name,"

 

Maybe you could call it #tupleDo:?

 

                #(1 2 3) tupleDo: [:a :b :c | …]

 

Mark

 

Mark Plas
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From: Esug-list <[hidden email]> On Behalf Of Christian Haider
Sent: zaterdag 28 maart 2020 13:43
To: [hidden email]; [hidden email]; [hidden email]
Subject: [Esug-list] destructDo:

 

Hi,

 

I am using a nice little method #destructDo: for a while now and it feels good.

In VisualWorks:

SequenceableCollection>>destructDo: aBlock

                                "Evaluate aBlock with the receiver's elements as parameters.

                                aBlock takes its arguments from the receiver.

                                'ok'

                                #(1 2 3) destructDo: [:a :b :c | a + b + c]

                                #(1 2 3) destructDo: [:a :b | a + b]

                                #(1 2 3) destructDo: [:a | a]

                                #(1 2 3) destructDo: [42]

                                'not ok'

                                #(1 2 3) destructDo: [:a :b :c :d | a + b + c + d]

                                "

                                ^aBlock cullWithArguments: self asArray

 

In Amber: 

SequenceableCollection>>destructDo: aBlock

                                ^aBlock valueWithPossibleArguments: self

 

In Pharo and other dialects, I don’t know, but should be as easy.

 

For example you can do

                (('2020-03-28' tokensBasedOn: $-) collect: #asNumber) destructDo: [:year :month :day |

                               Date newDay: day monthNumber: month year: year]

 

I like that the block is not the receiver (like with #valueWithArguments or #cullWithArguments), but the last argument.

 

Now the questions:

• I am sure that others came up with this. Anybody knows?
• What are you using for this pattern?
• I don’t really like the name, but haven’t found anything better yet. Maybe #destructedDo: or just #destructed: or: #withPartsDo:… maybe something shorter? Ideas?
• What are you thinking about this?

 

Happy hacking,

                Christian

 

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