301: Mainline

As you would expect, Smalltalk also offers the whileFalse: message. You can rewrite powerOfTwo to test for n equal to zero, rather than n not equal to zero:

Integer method definition • instance 
powerOfTwo 
  | n result | 
  n := self. 
  result := 1. 
  [n = 0] whileFalse: [n := n - 1.  result := 2 * result]. 
  ^ result 
Workspace
Transcript show: 4 powerOfTwo printString 
Transcript 
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