|
|
|
|
|
|
|
It is possible to use an and: message instead of an ifTrue:
message by exploiting the property that the argument block in an
and: expression is evaluated only if the receiver is true.
Note, however, that most programmers object to the use of and: and
or: messages to only allow or prevent evaluation. They argue that,
when an and: or or: message is included in an expression
anyone—other than the original programmer—naturally expects the value
produced by the expression to be used. If the value is not used, the
person who looks at the program may wonder whether the original programmer
left out a portion of a method definition unintentionally.