Function unflatten

Un-Flatten the given object. Given an object without nested elements, but whose keys represent paths in a nested elements object, return an object that has nested objects in it. This the reverse of flatten, in such a way that this complies.

Example

unflatten({
   'a.a1': 1,
   'a.a2': 2,
   'b.b1.b1i': 'hello',
   'b.b1.b1ii': 'world'
});
// this will yield:
{
   a: {
       a1: 1,
       a2: 2
   },
   b: {
       b1: {
           b1i: 'hello',
           b1ii: 'world'
       }
   }
}
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Additional options may be passed, such as which character is used as a delimiter, or the maximum depth level.