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Held: Monday, 28 September 2009
Summary: We consider a technique for stepping through the values in a list, and doing some action (e.g., moving a turtle or drawing something with the GIMP tools) for each value in the list.
map, but there are two problems.
map; it could be first to last, it could be last to first; it could be all at the same time.
for-eachfor situations like this.
map, but for sequences of actions.
for-eachis guaranteed to work in order.
for-eachdoesn't return anything.
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