Coding Meetup

Question 1

Count the number of JavaScript developers coming from Europe

var list1 = [
  { firstName: 'Noah', lastName: 'M.', country: 'Switzerland', continent: 'Europe', age: 19, language: 'JavaScript' },
  { firstName: 'Maia', lastName: 'S.', country: 'Tahiti', continent: 'Oceania', age: 28, language: 'JavaScript' },
  { firstName: 'Shufen', lastName: 'L.', country: 'Taiwan', continent: 'Asia', age: 35, language: 'HTML' },
  { firstName: 'Sumayah', lastName: 'M.', country: 'Tajikistan', continent: 'Asia', age: 30, language: 'CSS' }
];

function countDevelopers(list) {
  // your awesome code here :)
}

Answer 1

//filter arr 
//return length of  arr

return list
.filter(dev=> 
dev.continent === 'Europe' 
&& dev.language === 'JavaScript' )
.length

Question 2

Greet developers

Return an array where each object will have a new property ‘greeting’ with the following string value:

Hi < firstName here >, what do you like the most about < language here >?

var list1 = [
  { firstName: 'Sofia', lastName: 'I.', country: 'Argentina', continent: 'Americas', age: 35, language: 'Java' },
  { firstName: 'Lukas', lastName: 'X.', country: 'Croatia', continent: 'Europe', age: 35, language: 'Python' },
  { firstName: 'Madison', lastName: 'U.', country: 'United States', continent: 'Americas', age: 32, language: 'Ruby' } 
];

[{ firstName: ‘Sofia’, lastName: ‘I.’, country: ‘Argentina’, continent: ‘Americas’, age: 35, language: ‘Java’,
greeting: ‘Hi Sofia, what do you like the most about Java?’ …]

function greetDevelopers(list) {
  // thank you for checking out my kata :)
}

Answer 2

// forEach to add anew key:value pair.
//return modified list

list.forEach(dev => {
dev.greeting = Hi ${dev.firstName},what do you like the most about ${dev.language}?
})
return list;

Question 3

Is Ruby coming?

Your task is to return:

true if at least one Ruby developer has signed up; or
false if there will be no Ruby developers.

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' }
];

function isRubyComing(list) {
  // thank you for checking out my kata :)
}

Answer 3

return list.some(dev=>dev.language === ‘Ruby’);

Question 4

Find the first Python developer

Your task is to return one of the following strings:

< firstName here >, < country here > of the first Python developer who has signed up;

or

There will be no Python developers if no Python developer has signed up.

var list1 = [
  { firstName: 'Mark', lastName: 'G.', country: 'Scotland', continent: 'Europe', age: 22, language: 'JavaScript' },
  { firstName: 'Victoria', lastName: 'T.', country: 'Puerto Rico', continent: 'Americas', age: 30, language: 'Python' },
  { firstName: 'Emma', lastName: 'B.', country: 'Norway', continent: 'Europe', age: 19, language: 'Clojure' }
];

function getFirstPython(list) {
  // Thank you for checking out my kata :)
}

Answer 4

//new variable value of list.find
//return if new variable is not undefined return firstname and counter else return  "There will be no Python developers"

 let dev=list.find(dev=>dev.language === 'Python');
  return dev !== undefined ? `${dev.firstName}, ${dev.country}` :'There will be no Python developers'

Question 5

Can they code in the same language?

Your task is to return either:

true if all developers in the list code in the same language;

or

false otherwise.

var list1 = [
  { firstName: 'Daniel', lastName: 'J.', country: 'Aruba', continent: 'Americas', age: 42, language: 'JavaScript' },
  { firstName: 'Kseniya', lastName: 'T.', country: 'Belarus', continent: 'Europe', age: 22, language: 'JavaScript' },
  { firstName: 'Hanna', lastName: 'L.', country: 'Hungary', continent: 'Europe', age: 65, language: 'JavaScript' },
];

function getAverageAge(list) {

}

Answer 5

// list.every using list[0] as comparison.

return list.every(dev=>dev.language === list[0][‘language’] );

//for every developer in the list
//