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Evidently, to produce a string of a prescribed
length from a given string, you determine how
many padding characters you need, you create a new string filled with that
number of padding characters, and you concatenate the new string with the
given string. All these steps are expressed in the following definition of
the formatWithWidth: method:
String method definition • instance formatWithWidth: w *-- Number of padding spaces required | v ------------- ^ (String new: w - self size) atAllPut: $ , self printString ---------------------------------------- ^ | *-- String filled with padding spaces ----------------------------------------------------------- ^ | *-- Padded string