Code Blocks

[Ken Causey]

Pupeno's is not a terrible example but it's not great.  So here's my
attempt.

_ at lobby generateExampleBlock
[ | testValue |
  testValue: 3.
  ^ [Console ; (testValue as: String) ; '\n']
].

_ at lobby executeExampleBlock: aBlock
[  | testValue |
   testValue: 5.
   aBlock do.
].

executeExampleBlock: generateExampleBlock.

Slate 4> executeExampleBlock: generateExampleBlock.
3
Nil

The point to take here is that even though in the context where the
block was executed testValue redefined to be 5 the value output was 3
which is what the value was in the 'lexical' context where the block was
defined.

Ken

P.S. My experience with Slate is still somewhat limited so don't take
the code above as anything other than example of the concept of lexical
closure and maybe not even a great one of that.
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