Loop problem on Dr Stef

Hello,

When I select this part:

1 to: 100 do:
   [:i | Transcript show: i asString; cr ].

And do print it.

I only see 1 where I expected to see all the numbers from 1 till 100.

What went wrong ?

Roelof

Hello,

You should open Transcript, and than do it, instead of print it.

Mark

2014-03-30 14:45 GMT+03:00 Roelof Wobben <[hidden email]>:

Hello,

When I select this part:

1 to: 100 do:
  [:i | Transcript show: i asString; cr ].

And do print it.

I only see 1 where I expected to see all the numbers from 1 till 100.

What went wrong ?

Roelof

On 30 Mar 2014, at 1:45 , Roelof Wobben <[hidden email]> wrote:
"print it" prints the return value of the expression.
In the above case, that is the return value of the to:do: method, which is the receiver, so 1 is printed.
(If you read the implementation of to:do: on Number, you’ll see there is no explicit return using ^ , in such cases the return is always the receiver)

If you wanted to print a list of 1 .. 100 (which would be printed with print it), you’d use a method which returns such a collection for example collect:;
(1 to: 100) collect: [:each | each ].

The () are needed, since there is no to:collect: method, so instead we send  collect: to an interval, which we create using 1 to: 100.

Cheers,
Henry