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'use strict';

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

// Projection

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

.reduce((hash, key) => (hash[key] = meta[key]

.reduce((val, fn, i) => (i ? fn(val) : obj[fn]), null), 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 },

];

// Metadata

const md = {

name: ['name'],

place: ['city', (s) => '<' + s.toUpperCase() + '>'],

age: ['born', (year) => (

new Date().getFullYear() - new Date(year.toString()).getFullYear()

)]

};

// Usage

const p1 = partial(projection, md);

const data = persons.map(p1);

console.dir(data);