On 02/06/2012 07:08 PM, Cedric Greevey wrote:
On Mon, Feb 6, 2012 at 12:33 PM, Manuel Paccagnella
<[email protected]> wrote:
For binding both vars and functions, what's preferred? Using only let for
both:
(let [capitals [...]
ask-capital (fn [] ...)
...)
or instead let coupled with letfn?
(let [capitals [...]]
(letfn [(ask-capitals [...))
I'd usually just use let. The only advantage that I know of to naming
local functions with letfn is that you can put mutually recursive
functions in letfn, or, more generally, functions that refer to one
another in a circular manner. With plain let, functions later in the
let can refer to ones earlier in the let but not vice versa so you can
manage by putting them in the right order if there aren't any
circularities but you need letfn if there are circularities (barring
ugly hacks involving atoms or similar).
Clear explanation, thank you Cedric!
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