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The put() operator takes two arguments: a hash path and a new element to be inserted. The element must itself be a map. The result is a new data a structure with the element inserted at the location specified by the hash path. If the path specifies a location that does not exist, it will be created. If the location already has a value, it will be replaced by the new element. For example:

a = { "colors" : "many",
      "pi" : [3,1,4,1,5,6,9]
    };
b = {"flop" : 12};
c = a.put(["foo"], b);
// c = { "colors" : "many",
//       "pi" : [3,1,4,1,5,6,9],
//       "foo" : {"flop" : 12}
//     };
d = a.put(["foo", "bar"], b);
// d = { "colors" : "many",
//       "pi" : [3,1,4,1,5,6,9],
//       "foo" : {"bar" : {"flop" : 12}}
// };

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