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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