On Friday, 8 April 2016, Valentin Ryckewaert <valentin.ryckewa...@gmail.com>
wrote:
> Hello everyone,
>
> i'm learning Pharo and i'm having difficulties to understand the symbols,
> what are they? How are they different of the ByteString ? Why are they
> usefull ?
> Why should I put #string where I can put 'string' ?
>
Hi,
As the others said, symbols are some kind of string that are unique in the
image. I would like to talk also about a super cool feature.
A Block can receive the message #value:. For example when you do a #do: on
a collection, the block will receive multiple #value: message with the
element in argument.
[ :class | class allSubclasses] value: Object.
And the cool feature is that Symbol also have this method, so with the
polymorphism you can do:
#AllSubclasses value: Object
{ Object . Morph . Integer . Float } collect: #allSubclasses
This is a pretty cool feature that I wanted to share.
>
> Thanks in advance for your answer.
> Valentin Ryckewaert
>
--
Cheers
Cyril Ferlicot
