Re: [Pharo-users] mentor question 4

[Roelof Wobben via Pharo-users]

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Op 30-4-2020 om 10:31 schreef Ben Coman:

collection := '8569 2478 0383 3437'.

(collection reverse selectWithIndex: [:item :index | (index % 2 == 0) ifTrue: [item *2]] )  inspect

I see a error and the non-even numbers are nill now.

but after some figgeling this seems to work :

collection := '8569247803833437'asArray.

checkNumber := (collection reverse withIndexCollect: [:item :index | (index % 2 == 0) ifTrue: [item asInteger *2] ifFalse: [item asInteger]] ) sum inspect

^ checkNumber isDivisibleBy: 10

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