off top of my head i would probably do something like:
1. (-> some-var
(assoc :foo "bar")
other-operation
and-another)
(see threading macros)
2. (update-in some-map [:entry] #(or % (get-new-value)))
in particular, im not sure if there is a more idiomatic way
On Mon, Nov 21, 2011 at 12:46 AM, gchristnsn <[email protected]> wrote:
> 1. Often I use the following construct:
>
> (let [some-var (initial-binding)
> some-var (some operations (assoc, etc.) using some-var pvevious
> binding)
> some-var (some operations using some-var pvevious binding
> several times)]
> (more operations on some-var))
>
> This is probably something like the `do' monad, and I like the thing
> that the usage of previous binding of the variable is possible freely
> anywhere in the context without wrapping operations with fn and
> calling threading operator.
> But things become bad if misspelling occurs. Are there some library
> macros for such operations, or possibility to do this in less error-
> prone way?
>
> 2. Let's assume that there is a map with key :entry, and I need to
> assoc new value for this key if it's nil or leave map as is otherwise.
> I do this in following way:
>
> ...
> (let [some-map (if (:entry some-map)
> some-map
> (assoc some-map :entry (get-new-value)))]
> ...
>
> The question is the same: what is the most correct way to do this?
>
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