ramda-hard

var Benchmark = require('benchmark');
var expect = require('expect');
var _ = require('lodash');
var R = require('ramda');
var suite = new Benchmark.Suite;

var testArray = [
  { items: [{status: 'new', payload: [1, 2, 3]}, {status: 'old'}, {status: 'new', payload: [2, 1, 4]}]},
  { items: [{status: 'new', payload: [8, 2, 7]}, {status: 'new', payload: [0, 2, 9]}, {status: 'old'}]},
  { items: [{status: 'old'}, {status: 'new', payload: [5, 2, 3]}, {status: 'new', payload: [1, 4, 3]}]}
];
var resultat = [[[1,2,3],[2,1,4]],[[8,2,7],[0,2,9]],[[5,2,3],[1,4,3]]];

suite
    .add('es3', () => es3(testArray))
    .add('es5', () => es5(testArray))
    .add('lodash', () => lodash(testArray))
    .add('ramda', () => ramda(testArray))
    .on('cycle', event => console.log(String(event.target)))
    .on('complete', function() {console.log('Fastest is ' + this.filter('fastest').map('name'))})
    .run({ 'async': true });

function es3(array) {
    var length = array.length,
        result = Array(length),
        i = 0;

    for(; i < length; i++) {
        var items = array[i].items,
            lengthItems = items.length,
            payload = [],
            j = 0;

        for (; j < lengthItems; j++) {
            if (items[j].status === 'new') {
                payload.push(items[j].payload);
            }
        }
        
        result[i] = payload;
    }

    return result;
}

function es5(arr) {
    return arr.map(function(item) {
        var result = [];
        item.items.forEach(function (d) { if (d.status === 'new') { result.push(d.payload); } });
        return result;
    })
}

function lodash(arr) {
    return _.map(arr, function (item) {
        var result = [];
        _.forEach(item.items, function (d) { if (d.status === 'new') { result.push(d.payload); } });
        return result;
    })
}

function ramda(arr) {
    return R.compose(
        R.map(R.map(R.prop('payload'))),
        R.map(R.filter(R.propEq('status', 'new'))),
        R.map(R.prop('items'))
    )(arr);
}

expect(es3(testArray)).toEqual(resultat);
expect(es5(testArray)).toEqual(resultat);
expect(lodash(testArray)).toEqual(resultat);
expect(ramda(testArray)).toEqual(resultat);
console.log('Тесты прошли');