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You can also add the numbers in an Array
instance by arranging for integers between 1 and the size of the array to
be assigned to a parameter. Then you can use the parameter as an array
index inside a block.
Thus, you have the following alternative to the approach in
Segment 383 for adding up the numbers in an array. Note that
the size message determines the size of the array:
Array method definition • instance sumUp | sum | sum := 0. 1 to: self size do: [:index | sum := sum + (self at: index)]. ^ sum Workspace Transcript show: (Array with: 570 with: 720 with: 640 with: 720) sumUp printString Transcript 2650