functional-programming-2.js

var R = require("ramda");
//
// get top 3 vetted Frontend Developers names,
// who completed hackerrank with the score >=90
// ordered by rate: from lower to higher.

var hackerrankResults = [
  {hackerrank: 90,  name: "Maria",  category: "Frontend", vetted: true,  rate: "1000"},
  {hackerrank: 20,  name: "Maria",  category: "Frontend", vetted: true,  rate: "1000"},
  {hackerrank: 100, name: "Maria",  category: "Frontend", vetted: true,  rate: "1000"},
  {hackerrank: 100, name: "Galina", category: "Frontend", vetted: true,  rate: "2000"},
  {hackerrank: 95,  name: "Olga",   category: "Frontend", vetted: true,  rate: "3000"},
  {hackerrank: 65,  name: "Ira",    category: "Frontend", vetted: true,  rate: "3000"},
  {hackerrank: 100, name: "Vika",   category: "Frontend", vetted: false, rate: "1000"},
  {hackerrank: 100, name: "Nadya",  category: "Backend",  vetted: true,  rate: "1000"},
];


var results = R.pipe(
  R.filter(hr => hr.vetted && hr.category == "Frontend" && hr.hackerrank >= 90),
  R.uniqBy(R.prop("name")),
  R.sort((item1, item2) => item1 - item2),
  R.slice(0, 3),
  R.map(hr => hr.name)
)(hackerrankResults);

console.log(results);