Great stuff - thanks Jim. (not sure why my previous post got lost)
On Tuesday, November 19, 2013 11:48:17 AM UTC, Jim foo.bar wrote:
>
> On 19/11/13 11:42, Jim - FooBar(); wrote:
> > On 19/11/13 11:29, Colin Yates wrote:
> >> Imagine the sequence represents a distribution between 1 and 5. The
> >> initial sequence might only be [{:key 3 :value 30} {:key 4 :value
> >> 40}]. I want it to be [{:key 1 :value nil} {:key 2 :value nil} {:key
> >> 3 :value 30} {:key 4 :value 40} {:key 5 :value nil}].
> >
> >
> > (def map-seq [{:key 3 :value 30} {:key 4 :value 40}])
> > (def mandatory-keys (range 1 6))
> >
> > (sort-by :key
> > (reduce
> > #(if (some #{%2} (map :key %))
> > %
> > (conj % {:key %2 :value nil})) map-seq mandatory-keys))
> >
> > => ({:key 1, :value nil} {:key 2, :value nil} {:key 3, :value 30}
> > {:key 4, :value 40} {:key 5, :value nil})
> >
> >
> > Jim
>
>
> of course if the keys are known in advance, you don't want to calculate
> them every single time:
>
> (let [ks (map :key map-seq)]
> (sort-by :key
> (reduce
> #(if (some #{%2} ks) %
> (conj % {:key %2 :value nil})) map-seq mandatory-keys)))
>
> Jim
>
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