"The usual block evaluation as you know from Standard Smalltalk "
|squareBlock |
Transcript open.
squareBlock := [:x | Transcript show: 'We compute square'. x * x  ].
squareBlock value: 2.   "The block is evaluated"
squareBlock value: 3.   "The block is evaluated a second time"
squareBlock value: 2.   "The block is evaluated a third time"


"=> The Transcript shows 'We compute square'' 3 TIMES as it always
      has to evaluate the block to get the result.
      So we do not memoize (remember) the result of previous block 
      evaluations although for the same input the block would always give the same result."