On 11 Mar 2014, at 10:19, Clément Bera <bera.clement@gmail.com> wrote:
Hello,
[ Note: So in the default Pharo the method is named #sort: not #sortByProp: or #sortBy: but it's a detail ]
Yes, my mistake, I was misguided by #isSortedBy: Now #sortByProp: is my own example method that accepts a block and executes it for each sortable item and then the result is compared. I donât like the idea to implement #value:value: for a symbol because it caries a bit of a logic inside it. Uko
I like this idea because I also have always the problem. So I would like to be able to do:
projects sort: #creationDate
The implementation would be, in a similar fashion to how Symbol>>value: is implemented for aCollection collect: #isPlague :
Symbol>>value: val1 value: val2 ^ (val1 perform: self) <= (val2 perform: self)
Then :
(#( 10 42 31 23 90 87 65) collect: #asValueHolder) sort: #value
Answers:
an Array(a NewValueHolder[ 10 ] a NewValueHolder[ 23 ] a NewValueHolder[ 31 ] a NewValueHolder[ 42 ] a NewValueHolder[ 65 ] a NewValueHolder[ 87 ] a NewValueHolder[ 90 ])
which is correct :-).
However I do not like:
projects sort: [ :proj | proj author birthDate ]
If you allow that where is the limit to the thing you want to allow ? In addition, I do not see any nice implementation and you could just implement in project
Project>>authorBirthDate ^ self author birthDate
Best,
Clement
2014-03-11 9:19 GMT+01:00 Yuriy Tymchuk <yuriy.tymchuk@me.com>: Hi guys.
This is a thing that I encounter quite often.
Eg I have a collection of projects and I want to sort them by creation date. It would be nice to be able to do something like:
projects sortByProp: #creationDate
or by birth date of the author
projects sortByProp: [ :proj | proj author birthDate ]
Maybe Iâm wrong, but as Iâve told already I encounter it quite often and writing something like
projects sortBy: [ :prev :next | prev creationDate <= next creationDate ]
is boring for me.
Cheers. Uko