Range over Integers and Functions

The two loops in the program below look almost the same. The first ranges over a slice, and the second ranges over a function named orderIDs. Both print order IDs and both stop at 1002.

Output:

slice loop: 1001
slice loop: 1002
iterator: start
iterator: sending 1001
loop body: 1001
iterator: sending 1002
loop body: 1002
iterator: told to stop
after loop

The slice loop prints only its own lines. The second loop is different, because the output alternates between orderIDs and the loop body. Its break also ended the for loop inside `orderIDs

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