toAssociativeArray()
toAssociativeArray(array  $mapEntriesList): array
                Transforms list of map entries to a PHP associative array. Each map entry is expected to be a `[Key]_[Value]MapEntry` that contains a key field and a value field.
For example, if the list of map entries were:
[
  (String_StringMapEntry: key => 'animal', value => 'sheep'),
  (String_StringMapEntry: key => 'spirit_animal', value => 'bear'),
  (String_StringMapEntry: key => 'primal_animal', value => 'sloth')
]Then this method would return the following associative array:
[
   'animal' => 'sheep',
   'spirit_animal' => 'bear',
   'primal_animal' => 'sloth'
]Parameters
| array | $mapEntriesList | a list of map entries | 
Throws
- \UnexpectedValueException
- if any map entries in the list are invalid 
Returns
array —an associative array of the entries