Hi Karin,
My favourite metaphor is similar to the ones given already, I just flip
pages on a book. I like the book analogy because the action could be, read
the page, search for a string or fill the "o"s. Additionally, since the
books have page numbers I could get the "index" too (ie. enumerate) - but I
don't explain the two examples at the same time, the I introduce the
`enumerate` function to people is already confident with the loop.
book is a collection (list) of pages
for page in book:
read(page)
for page_number, page in enumerate(book):
...
Hope it helps,
David
On 3 December 2015 at 09:24, Karin Lagesen <[email protected]> wrote:
> The more I teach, the more I realize that I am not really able to convey
> what a for loop does to everybody. Do any of you have a metaphor or
> something that you use for teaching it? I explain about variables and
> collections, and the body of the loop, and I show examples, but I am still
> not able to get through all the time.
>
> Karin
>
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