Hi everyone,
this is simply question for of course opinionated views of my approach.
I have some user input (nevertheless where it comes from, web form input,
rich client... whatever).
Single field can be (as usual) "equipped" with couple of validations,
empty, format, strength (if it is about password) ...etc
So in absence of objects :) my best friends are functions so, when input
value is validated I need to come out with map like:
{
:empty "Field empty"
:format "Format not valid"
:strength "Weak"
}
So i need "id" of validation (key) which produced message (value)
So, simply, I have vector containing arbitrary set of functions to be
applied over value and simply reduce over them.
0-arity overload returns validation key of that validator, and 1-arity
performs actual check.
To avoid excessive code here is "overnaive" example:
(let [fns [(fn ([] :empty) ([x] "x")) (fn ([] :format) ([y] "y"))] val "field
value"]
(reduce #(assoc % (%2) (%2 val)) {} fns))
this yields exactly what I need :
{:empty "x", :format "y"}
(real reducing function would check what validator returned and skip or
assoc particular result into map).
Now, I am not really sure how functional this approach of "self contained"
function is, where particular 0 arity is used
to give key. My idea is rooted in fact that e.g. 0-arity + function gives
neutral element for addition.
Personally, I like it :) but I would like 2nd opinion as I am maybe
brutally misusing functional programming :)
Thanks! :)
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