hof-3-is-ruby-coming.js

// ***********************************************************************************************************************
// https://www.codewars.com/kata/coding-meetup-number-3-higher-order-functions-series-is-ruby-coming

// You will be given an array of objects (associative arrays in PHP) representing data about
// developers who have signed up to attend the next coding meetup that you are organizing.

// Your task is to return:

// true if at least one Ruby developer has signed up; or
// false if there will be no Ruby developers.
// For example, given the following input array:
// var list1 = [
//   { firstName: 'Emma', lastName: 'Z.', country: 'Netherlands', continent: 'Europe', age: 29, language: 'Ruby' },
//   { firstName: 'Piotr', lastName: 'B.', country: 'Poland', continent: 'Europe', age: 128, language: 'Javascript' },
//   { firstName: 'Jayden', lastName: 'P.', country: 'Jamaica', continent: 'Americas', age: 42, language: 'JavaScript' }
// ];
// your function should return "true".

// ***********************************************************************************************************************

// solution 1:

function isRubyComing(list) {
  for (let i = 0; i < list.length; i++) {
    if (list[i].language === 'Ruby') return true;
    return false;
  }
}

// solution 2:
const isRubyComing = list => list.some(({ language }) => language === 'Ruby');