sort method

void sort(
  1. String fieldName,
  2. Sorting sorting
)

{"name" : "x" , "age" : 15} , {"name" : "y" , "age" : 20} , {"name" : "z" , "age" : 25}

sort("age" , Sorting.ascending) => (first element) {"name" : "x" , "age" : 15}

Implementation

void sort(String fieldName, Sorting sorting) {
  _sorts[fieldName] = sorting;
}