If you really want something that can be called repeatedly and returns
something different each time (rather than just iterating through an
infinite sequence, which seems like it would be the more functional-ish
approach):
user> (defn cycle-gen [input]
(let [iter (atom (cycle input))]
(fn [] (let [v (first @iter)]
(swap! iter rest)
v))))
#'user/cycle-gen
user> (def colors (cycle-gen '(red green blue)))
#'user/colors
user> (colors)
red
user> (colors)
green
user> (colors)
blue
user> (colors)
red
user> (colors)
green
user> (colors)
blue
On Wed, Mar 26, 2014 at 12:59 PM, Christopher Howard
<cmhowa...@alaska.edu>wrote:
> Hi. I'm still fairly new to Clojure. I was wondering: What's the
> easiest way to make a generator (or something that would be as useful).
> In one application, I need something that will return a different color
> each time I call it - following a predefined list of colors, and
> starting over again at the beginning when colors are exhausted.
>
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--
Ben Wolfson
"Human kind has used its intelligence to vary the flavour of drinks, which
may be sweet, aromatic, fermented or spirit-based. ... Family and social
life also offer numerous other occasions to consume drinks for pleasure."
[Larousse, "Drink" entry]
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