In an attempt to be slightly more "elegant" (whatever that means ;-) ):
-----8<-----8<-----
(def start [{:key 3 :value 10} {:key 6 :value 30}])
(into [] (map (fn [[k v]] {:key k :value v})
(merge
(into {} (for [x (range 6)] {x nil}))
(into {} (map (juxt :key :value) start)))))
;;=> [{:key 6, :value 30} {:key 0, :value nil} {:key 1, :value nil} {:key 2,
:value nil} {:key 3, :value 10} {:key 4, :value nil} {:key 5, :value nil}]
-----8<-----8<-----
Cheers,
Josh
On Tuesday, November 19, 2013 at 2:00 PM, Jim - FooBar(); wrote:
> On 19/11/13 11:29, Colin Yates wrote:
> > In Java I would do something like:
> >
> > // create a convenient look up to avoid nasty N^2 lookups
> > Map<Object, Object> keyToValue = new HashMap....
> > for (Map<Object, Object> kvMap: kvSequence)
> > keyToValue.put(kvMap.get("key"), kvMap.put("value"));
> >
> > List<Object> allKeys = calculateAllKeys();
> >
> > List<Map<Object, Object>> results = new Array....
> > for (Object key: allKeys)
> > Object result = keyToValue.get(key); // null is fine for missing keys
> > results.put(key, result);
> >
> > return results;
>
>
> this code doesn't do any sorting of keys so I'm not sure it would give
> you the exact desired result you posted...
>
> Jim
>
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