const R = require('ramda');

const { allPass, propEq, lte, propSatisfies, filter } = R;

const cars = [

    {

        name: 'suv',

        doors: 4,

        mpg: 19

    },

    {

        name: 'sedan',

        doors: 4,

        mpg: 30

    },

    {

        name: 'hybrid',

        doors: 4,

        mpg: 37

    },

    {

        name: 'compact',

        doors: 2,

        mpg: 32

    }

];

const mpgLte30 = propSatisfies(lte(R.__, 30), 'mpg');

const fourDoors = propEq('doors', 4);

const preds = allPass([

                          mpgLte30,

                          fourDoors

                      ]);

const result = filter(preds)(cars);

console.log(result);