Fix the classic loop closure bug

This is the bug that made let worth shipping. A loop builds one callback per item; because var i is function-scoped, all the callbacks close over the *same* i, and by the time any of them runs the loop has finished and i sits one past the end. Every handler reports the last index — or, as here, undefined.

The starter code contains exactly that bug. Fix makeLoggers(items) so it returns an array with one function per item, in order, where the function at index i returns the string i + ":" + items[i] — for example "0:a". The functions must be correct however many times and in whatever order they are called, and an empty input array must produce an empty array.

What it has to do

• Return one function per item, in the same order as the input.
• The function at index i returns i + ":" + items[i], so each closure captures its own index.
• Calling the functions repeatedly or out of order returns the same results.
• An empty input array returns an empty array.

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