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'use strict';

const partial = (fn, ...args) => (...rest) => fn(...args, ...rest);

const projection = (fields, obj) => Object.keys(obj)

.filter((field) => fields.includes(field))

.reduce((hash, key) => (hash[key] = obj[key], hash), {});

// Dataset

const persons = [

{ name: 'Marcus Aurelius', city: 'Rome', born: 121 },

{ name: 'Victor Glushkov', city: 'Rostov on Don', born: 1923 },

{ name: 'Ibn Arabi', city: 'Murcia', born: 1165 },

{ name: 'Mao Zedong', city: 'Shaoshan', born: 1893 },

{ name: 'Rene Descartes', city: 'La Haye en Touraine', born: 1596 },

];

// Usage

const p1 = partial(projection, ['name', 'born']);

const p2 = partial(projection, ['name']);

const data = persons.map(p1).map(p2);

console.dir(data);