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In the following example, the argument block in the and:
expression is evaluated only if self is greater than 1200.
The argument block in the or: expression is evaluated only if
self is not greater than 1200.
Note that the parentheses are mandatory; without them, Smalltalk would
think you were trying to use and:ifTrue: and or:ifTrue:
messages:
Integer method definition • instance analyzeCalories (1200 <= self and: [self <= 1600]) ifTrue: [Transcript show: self printString; show: ' is reasonable'; cr]. (self < 1200 or: [self > 1600]) ifTrue: [Transcript show: self printString; show: ' is unreasonable'; cr] Workspace 1700 analyzeCalories. 1400 analyzeCalories. 1100 analyzeCalories Transcript 1700 is unreasonable 1400 is reasonable 1100 is unreasonable