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Add an entry to a map

Given an empty pets map, add the mapping from "rob" to "dog"
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python
pets['rob'] = 'dog'
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cpp C++/CLI .NET 2.0
pets->Add("rob", "dog");
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cpp C++/CLI .NET 2.0
pets["rob"] = "dog";
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clojure
(assoc {} 'rob 'dog)
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erlang
Pets1 = dict:store(rob, dog, Pets0).
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erlang
ets:insert(Pets, {rob, dog}).
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erlang
Pets1 = gb_trees:enter(rob, dog, Pets0).

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