On this laptop I have
- Squeak
- Pharo
- GNU Smalltalk
- VisualAge Smalltalk
- VisualWorks Smalltalk
- Smalltalk/X
plus some oddballs like susie, amber, and CSOM.
On another laptop I have
- Strongtalk
- Dolphin
And of course I have my own 'astc' Smalltalk-via-C compiler.
I have to say that
Thanks,
for the discusson and lessons.
I will think about it and also think if smalltalk is for me.
I did the pharo Mooc and still have a lot of problems making the
smalltalk way click in my head so I can solve little problems like
this.
You are expected to use my code fragments for *ideas*,
not to incorporate them *literally* in your code. As
I explained, *without seeing the specification*, I have
no way to tell whether the specification uses a left-handed
or right-handed coordinate system.
For what it's worth, here's a
yes, this is a real tests from the
pharo track on exercism.io
I understand what you mean but maybe I overthinking things.
But if we have a robot facing north and the robot turns to the
left , im my oponion it faces now to the east.
like
The basic issue here is abstraction.
An instance of "Robot" in your program is not a
physical object. How could it possibly point North,
South, or Nor-nor-west? It cannot.
Its location and direction are abstract values
*metaphorically* related to real world notions
like position vectors and
Richard thanks.
One thing I do not see direct.
you said :
A
direction could be represented by a pair of integers
dx,
dy such that |dx|+|dy| = 1. It could also be
represented
by a Point with
Op 8-4-2019 om 10:57 schreef Richard
O'Keefe:
One thing I have often
seen and lamented is students
writing excessively
complicated code with way too many
classes. There is a
huge difference between
One thing I have often seen and lamented is students
writing excessively complicated code with way too many
classes. There is a huge difference between
"A Robot knows its position and direction."
and
"A Robot has-a Position and has-a Direction."
The first is the important one. The second is
I can try to explain what I trying to
solve.
I have a Robot which can turn left, turn right or moveForward.
now I have a string like 'LAR'
that means the robot needs to turn left (l) , move forward one
place (A) and turn left.
It would really REALLY **REALLY** help if we knew what
the heck you were trying to do. There is an excellent
chance that it is MUCH simpler than you think. If you
cannot show us the Smalltalk version of the problem,
can you show us the version for some other language?
On Sun, 7 Apr 2019 at
Op 6-4-2019 om 15:15 schreef K K Subbu:
On 06/04/19 4:49 PM, Roelof Wobben wrote:
Hello,
I just learned double dispatch.
And now for the Robot challenge of exercism Tim has pointed me to
this
article(https://blog.metaobject.com/2019/04/accessors-have-message-obsession.html)
but I fail to
oke,
so I need a single Object here
that contains this in a initialize function :
north = Direction( 0, -1)
east = Direction( 1, 0)
south = Direction( 0, 1)
west = Direction(-1, 0)
oke, then time to figure out how to change my functions because
On 06/04/19 4:49 PM, Roelof Wobben wrote:
Hello,
I just learned double dispatch.
And now for the Robot challenge of exercism Tim has pointed me to this
article(https://blog.metaobject.com/2019/04/accessors-have-message-obsession.html)
but I fail to see how the move method looks like in that
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