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Key value pairs in dictionary, and how to retrieve them given one?
I’m wondering on how to retrieve the key given the value of a dictionary?
The way to get value given the key is
array[key] – this will output the value, but what if I have the value and am looking to get the key?
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2 Replies
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q)d:`a`b`c!1 2 3 q)d[`a] 1 q)d?1 `a q)d:`a`b`c`d!1 2 3 1 q)d?1 `a
be mindful, with this method and duplicate values, only the first key is returned
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you also can use where clause, which return all keys that have duplicates:
q)dic:`a`b`c`d!1 2 3 1 q)where dic=1 `a`d
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