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Another way to define displayFatCalories is to use Smalltalk's
string-concatenation method, which is written as a comma. The
concatenation method is sent to a string with another string as an
argument. The answer is a string in which the two strings are
concatenated.
Integer method definition • instance displayFatCalories Transcript show: 'There are ' , (self * 9) printString , ' calories in the fat'