example for reverse array to array

index.js

var data = {
    "schools" : [
        {
            "name" : "school a",
            "abbvr" : "AED",
            "students" : [
                {"name" : "a"},
                {"name" : "b"}
            ]
        },
        {
            "name" : "school b",
            "abbvr" : "EG",
            "students" : [
                {"name" : "c"},
                {"name" : "d"}
            ]
        },
        {
            "name" : "school c",
            "abbvr" : "ESA",
            "students" : [
                {"name" : "e"},
                {"name" : "f"}
            ]
        }
    ]
};

var JM = require('json-mapper');

_reduce = function(fn,tail){
    return function(input){
        if (input instanceof Array){
            return input.reduce(fn,tail);
        }
        return void 0;
    }
};

var SimpleSchool = JM.makeConverter({ 'name':'name', 'abbvr':'abbvr'});
var SimpleStudent = JM.makeConverter({ 'name':'name'});

var SchoolConverter = JM.makeConverter({
    students : ['schools', _reduce(function(tail,school){
        var _simpleSchool = SimpleSchool(school);

        if (school.students) {
            tail = tail.concat(school.students.map(function(student){
                var _simpleStudent = SimpleStudent(student);
                _simpleStudent.school = _simpleSchool;
                return _simpleStudent;
            }));
        }
        return tail;

    },[])]
});

console.log(JSON.stringify(SchoolConverter(data),null,2));

// should be

//{
//    "students": [
//        {
//            "name": "a",
//            "school": {
//                "name": "school a",
//                "abbvr": "AED"
//            }
//        },
//        {
//            "name": "b",
//            "school": {
//                "name": "school a",
//                "abbvr": "AED"
//            }
//        },
//        {
//            "name": "c",
//            "school": {
//                "name": "school b",
//                "abbvr": "EG"
//            }
//        },
//        {
//            "name": "d",
//            "school": {
//                "name": "school b",
//                "abbvr": "EG"
//            }
//        },
//        {
//            "name": "e",
//            "school": {
//                "name": "school c",
//                "abbvr": "ESA"
//            }
//        },
//        {
//            "name": "f",
//            "school": {
//                "name": "school c",
//                "abbvr": "ESA"
//            }
//        }
//    ]
//}